Make a portable refrigerator with your own hands. Making a cooler bag with your own hands, step by step instructions. What can be made from

17.05.2020

A cooler bag will help keep food fresh during long trips. It is arranged on the principle of a thermos, keeping warm or cold inside. AT summer time this allows you to transport perishable products such as meat or dairy products over long distances, or enjoy the refreshing coolness of drinks. In winter, such a bag is indispensable if you need to keep cooked food warm.

A quality cooler bag is not cheap. Available for sale various models, they can be conditionally divided into three large groups:

shopping bags;
mobile bags for transporting products;
car trunk bags.

These varieties differ from each other only in shape (the size of the base bag and the materials from which it is made), and the principle of maintaining cold or heat is the same for them. Today we will present to your attention a master class on making a cooler bag with your own hands.

Instructions for making a cooler bag

Preparatory stage

To make a portable refrigerator, we need:

a bag;
foamed foil polyethylene;
scotch;
zipper;
scissors;
needle and thread;
pencil.

The base bag, which will then turn into a refrigerator, must be chosen depending on the needs: it can be large or medium in size, have a shoulder strap or regular handles. It is desirable that the selected model is closed with a zipper and has a stable base. You can sew the basis for the future refrigerator yourself.

Foamed foil polyethylene is a material characterized by lightness, strength and high thermal insulation qualities. It is sold in hardware stores in rolls 1.5 meters wide. For the manufacture of a small-sized cooler bag, no more than one meter of material is required. It is better to choose polyethylene covered with foil on both sides and at least 0.5 cm thick. It costs a little more, but retains heat or cold better.

Foamed foil polyethylene is an ideal material for making a cooler bag. It is easily bent and cut, is not afraid of moisture and weighs almost nothing.

It is better to choose an adhesive tape wide, and, if possible, metallized - it will create additional thermal insulation of the seams. Double-sided tape will allow not only to connect the details of the tab, but also to fix it inside the bag-capacity. The zipper can be replaced with Velcro.

So, all the elements of the future cooler bag are prepared, it's time to start assembling.

Manufacturing

Making a cooler bag is not that difficult. All pockets, partitions and other elements must first be removed from the lining of the base bag. The manufacturing process of a portable refrigerator can be divided into several stages:

First of all, you need to make a pattern that completely repeats all sides of the bag, but about 0.5 cm smaller in size (the foil tab should fit inside the bag). Be sure to provide a cover that will cover the structure from above. If the tab does not have a zipper, it is better to make the lid a little wider so that its end can be tucked in. The pattern is easy to make if you alternately apply all sides of the bag to the paper.
Then, according to the pattern, a tab is cut out of thermal insulation material and glued with tape to make something like a box with a lid. For convenience, the sides of the container can be pre-chopped with pins.
The resulting container is inserted into the base - the cooler bag is ready. For better thermal insulation, a zipper is sewn to the lid, and if there is space left between the walls of the base bag and the container, it is filled with foam rubber or cotton wool.

To make a cooler bag for shopping (thermal bag) you will need a more compact base bag and less material, but otherwise the manufacturing process will be the same. But to equip the trunk of a car with a roomy cooler bag, you will need Additional materials and a little more time.

The basis for a large cooler bag is most often a plywood or cardboard box. As a thermal insulation material, foam sheets are inserted inside it, repeating the dimensions of the walls of the box and its bottom. The foam layer is followed by a layer of foamed polyethylene foil, which is fixed with adhesive tape along the seams and along the upper perimeter of the box. The lid for the box is also insulated. To make the bag easier to carry, you can sew a cover with handles for it.

So, making a cooler bag with your own hands is not difficult at all. However, such a bag does not produce cold by itself; additional sources are needed for this. Cold accumulators can be bought at the store, or you can make it yourself at no extra cost.

Cold accumulators

Cold accumulators can have a liquid or gel base.

To make a liquid-based battery, just freeze water in an ice cube tray and place the pieces in a zip-lock bag. It is convenient to use such batteries: they do not take up much space, they “adjust” to the shape of the transported products. However, the ice melts over time, and the bags are not always airtight, so food can get wet.

More reliable containers are conventional plastic bottles in which water is directly frozen. The disadvantage of this homemade battery is that they take up a lot of space.

In order for the water to melt more slowly, salt is added to it before freezing in a volume of at least 6 tbsp. l. for 1 liter of water.

Gel-based batteries are more practical: they do not leak and keep cold even longer than salt water. You can make them in two ways:

from diapers. Water is poured into a new diaper, then the gel is taken out of it and placed in the freezer in a ziplock bag. As soon as the gel freezes, the battery is ready;
from gelatin or wallpaper glue. Dissolve gelatin or wallpaper paste in salt water according to the instructions on the package. The resulting gel-like mass is laid out in bags or bottles and frozen.

Rules for using a cooler bag

In order for the cooler bag to keep cold or warm for as long as possible, you need to follow simple rules:

it is better to put the products in the bag chilled, they can be wrapped in paper beforehand, since it keeps the cold well;
an additional layer of thermal insulation material or a blanket will help improve the quality of a portable refrigerator that is transported in the trunk of a car;
cold accumulators must be laid on the bottom or between products;
cooler bag will retain its properties longer if you avoid exposure to direct sunlight and frequent opening;
products in the bag should be laid as tightly as possible, the gaps can be filled with towels or pieces of dense foam.

If you make a cooler bag with your own hands and follow the simple rules for using it, the products in it can stay fresh for up to three days.

Video on the topic of the article

You can learn more about how to make a cooler bag with your own hands in the video below.

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Each of us has heard the phrases "thermal bag", "cooler bag". But for many, such a device seems unnecessary, and for some it is simply not affordable. Today MirSovetov will tell you how to quickly and almost free of charge make a cooler bag and how it can be used.

Buy or not?

On the eve of the summer season, my husband and I decided to get a cooler bag. We are lovers of wild holidays on lakes with tents, and for such a holiday, a cooler bag is an indispensable thing.

At first they wanted to buy a refrigerator for the car, but then they changed their minds. On the forums, they read a lot of negative reviews from the owners of such refrigerators - it is too bulky, it occupies half the car's interior, but inside, on the contrary, it is small, nothing fits. In general, they abandoned this idea.

We began to choose a thermal bag in online stores. The pleasure is also not cheap, and for a bag of the size we need, we would have to pay 500 hryvnias, plus cold accumulators. And, in fact, a thermal bag is an ordinary bag with a heater sewn inside, which does not let out the cold, and does not let the heat in from the outside. My husband is an engineer by education, he explained to me the essence of the idea. And we began to experiment - to make a cooler bag from improvised means, and then to test it during outings on nature on weekends.

Bag-refrigerator (thermal bag) do-it-yourself

To begin with, we went to the market and purchased a heater. The choice was made on polyethylene foam covered with foil. It looks like this:

Sold in all hardware stores. Usually they glue it under the battery, with foil inside the room. And in the heating season simple device saves 30% of heat, which is usually lost in environment. A linear meter of this material costs from 8 to 15 hryvnias (the price depends on the thickness of the polyethylene itself, we bought the thickest one - 10 mm). Its width is 1.5 meters. Enough, as they say, with the head.

We also needed tape (the wider the better). Well, actually, the bag that we planned to turn into a refrigerator. In principle, you can take a bag of any size - proceed from your needs.

The process of "transformation" itself took about 20 minutes. First, they cut out such a “cross” from the insulation.

If you glued boxes as a child, I think you guessed what was what. The central square is the bottom of the bag, the side squares are the walls, and the rest will be the lid. The foil should be inside the bag.

When you cut, keep in mind that after gluing the box will need to be inserted into the bag, so make patterns 5-7 centimeters smaller than the actual size of the bag. We initially chose a blue bag with a width of 70 cm, but, looking ahead, I’ll say that the “refrigerator” I cut out did not fit into it, but it went perfectly with my husband’s black meter-long sports bag.

Now, using adhesive tape, connect the sidewalls, gluing both outside and inside. Glue qualitatively, do not spare adhesive tape. The walls must fit snugly against each other, otherwise you will not achieve a thermal effect.

Initially, we cut the lid of the bag in one piece, but the insulation does not bend well, so we had to cut it off and glue it with tape. So she became more comfortable.

Now about where, in fact, the insulation waste has gone. We decided to glue the remaining four pieces at the joints of the sidewalls: we bent each square in half at 90 degrees and fixed it with adhesive tape (foil inside!). After that, the bag turned out to be double, which means that the thermal insulation has improved.

The resulting design is placed in a bag.

We have a box of insulation came in tightly. If suddenly there is a place left, I recommend that MirSovetov readers fill it with foam rubber or scraps of an old wadded blanket. So the insulation itself will not tear, and unnecessary heat will not pick up from the outside. In general, warm, do not be shy.

That's all, the cooler bag is ready.

It remains to make cold accumulators. Plastic bottles acted as batteries. If the bag is small, take half a liter, if larger, then a liter. Now we fill the bottles with a strong solution table salt(per liter of water - 6 tablespoons of salt) and freeze. You can fill old heating pads with saline and freeze them too.

Nuances of use

From personal experience I will say that:

cold accumulators should be located every 10-15 cm, only in this way the products do not heat up for a long time. And if you wrap frozen foods or drinks in heating pads, they will begin to thaw no earlier than after 12 hours;
wrap each product that you put in a bag in paper or newspaper - the paper will add a thermal insulation effect;
fold all products tightly, try not to have free space in the bag;
before closing the bag with a thermal lid, cover the food with paper and then with several towels. After that, tightly close the lid of the insulation, and then the lid of the bag itself;
try not to open the bag unnecessarily, do not let out the cold.

This bag keeps cold up to 24 hours. The first time we carried some food and cold drinks in it. After 12 hours, the drinks were still cool, and after another 8 they were already getting warmer. At the same time, even perishable products (eggs, cheese, ham) did not deteriorate after 20 hours.
But best way downloads we opened on the second trip. We went for two days, the air temperature was about 40 degrees plus. Products (very chilled) were transferred with the same heavily chilled drinks and frozen batteries. The heating pads were laid out on top, under the lid. The bag was in the car (I also wrapped it in a blanket) and for more than 30 hours the food was cool!
In general, we are very pleased with the result. I don’t know how many hours a branded cooler bag lasts, but our “home-made” exceeded all expectations.

And recently they made a thermal package. They bent a rectangle of insulation and glued it with tape on the sides. In it we carry frozen fruits from the dacha home (as a cold accumulator - a heating pad). Four hours of travel in the heat, and the fruit does not even thaw.

Maybe the idea of such a necessary invention will come in handy for you. Use on health! And if you figure out how to strengthen the thermal insulation and prolong the effect of the bag - write in the reviews.

Reading 8 min. Views 246

The problem of safety of perishable products is successfully solved by the refrigerator. With all the obvious advantages of this method, it has a significant drawback - the device is devoid of mobility. This inconvenience will help eliminate the cooler bag with your own hands. the simplest design. If necessary, it can be used as a thermos. Make such a container available materials pretty simple. At any time of the year, the product will become a useful device during short absences from the city.

What is

An ordinary-looking bag made of two layers of nylon fabric is lined with a heat insulator - foamed polyurethane or polyethylene. Pre-frozen foods are used as cold accumulators. A simple concept gives the desired effect. Such a portable refrigerator will be useful and not burdensome:

when working at remote sites where there are no conditions for preparing hot meals;
on long trips by car or train;
on the beach, picnics, summer cottages, on hikes.

The main advantage of a thermos bag compared to a container is the ability to compactly fold the container after it is empty. Some models of such bags can be additionally equipped with cold or heat accumulators - special plastic containers filled with gel, saline or dry ice. Such devices are able to maintain the required temperature for up to several days.

What can be made from

For sewing the product, a strong synthetic fabric is selected, which has water-repellent and sun-protection properties. To a greater extent, these qualities are present in nylon, polyvinyl chloride, polyester. Fabrics based on them are easy to clean from different kind dirt, dry quickly. In addition, the material must be characterized by increased density in order to exclude the possibility of mechanical damage during operation.

Foil isolon is used as a heater. It is an environmentally friendly material with a long service life, excellent thermal insulation properties, high strength characteristics, and low specific gravity. The base is polyethylene foam. The outer surface is laminated with aluminum foil and polypropylene film. Double protection protects the filler from chemical interaction with organic matter, which makes the material safe for food storage.

Master classes in manufacturing

Of the many ways that describe how to sew a refrigerator bag at home, we select several according to the criterion of mobility. Having understood the principle, everyone will be able to build their own version, based on, for example, indicators of usable volume, ease of transportation, aesthetic appearance.

For carrying by hand

You can simplify and speed up production as much as possible by taking a ready-made beach or sports accessory as a basis. In the absence of desire or opportunity, you will need a bag pattern and material for it. In addition, it will be useful for work:

foil tape;
folgoizolone;
synthetic winterizer or foam rubber;
wallpaper knife or scissors;
stapler or pins;
thread, needle.

The thickness of the material determines how long the portable refrigerator will keep the cold.

We manufacture the bag in the following sequence:

Measure your bag. Based on the results of measurements, draw a pattern of the internal cavity.
Transfer the pattern to foil isolon. Reduce the size by 1-2 cm. The gasket should fit freely into the bag. Cut out the lid with an overlap of 3-4 cm. When it is closed, the overlap should be tucked inward. The material for the gasket is taken at least 0.5 cm thick.
With a wallpaper knife, cut out the details of the internal cavity.
Stitch the edges together with a needle and thread. Glue the seams and joints from the inside with foil tape.
Insert the lining into the bag. Fill the voids between the gasket and the bag with synthetic winterizer or foam rubber. These materials are good thermal insulators. In addition, they will give the product a shape.

The work will be done neatly if the edges are pre-fastened with staples or pins.

Now we know how to make a portable refrigerator. The principle and sequence of actions is the same for the manufacture of a mobile refrigerator of any size.

Choosing a heater

We transfer the pattern to foil isolon

We cut out the parts and fasten them together with adhesive tape

We connect the joints with a stapler

Making the lid a little bigger than the bag

For auto

On long trips, you have to take more food than a portable cooler bag can hold. The way out is to make a special container for these purposes. Its dimensions are limited only by the internal volume of the trunk of the car.

The cooler bag in the car is large in size. In its manufacture, it is necessary to take into account some features dictated by this circumstance. The body must be strong and rigid. To make it you will need:

sheet plywood;
folgoizolone;
Double-sided tape;
metallized tape;
window seal;
PVA glue or specialized for wood;
silicone sealant;
glue Moment;
screws, hinges, latches.

Algorithm for manufacturing a car cooler bag:

Put together a box of the required dimensions from plywood sheets. Pre-lubricate the ends of the faces with PVA glue, fasten with screws. Lubricate the ribs with sealant. The lid of the box must be removable. You don't need to pin her down.
Cut foil isolon according to internal dimensions drawer with an allowance of 4-5 cm for overlapping.
Straighten the insulation in the box. Fix it with Moment glue in several places. Glue the edges of the lap joints with double-sided tape from the inside, metallized - from the outside. Fixing thermal insulation to inner walls plywood box is carried out pointwise. The glue spot is a "bridge" through which there is an increased heat transfer.
Glue a window seal on the inside around the perimeter of the cover. Insulate the area inside with foil isolon.
Install hinges and latches in place.
Paint the finished box from the outside with corundum-type heat-insulating paint. DIY cooler bag is ready.

Instead of heat-insulating paint, you can sew a protective cover with handles. This will make the design more convenient to move. Now we know how to replace a cooler bag on a long trip.

Reinforced version with foam

A somewhat more time-consuming option, which is more efficient than the previous ones. The cooler bag in the car is taken as the basis. Its design will need to be improved. To do this, you will need additional materials: sheet foam, polystyrene foam or polystyrene foam.

Manufacturing technology is as follows:

A box is assembled from plywood sheets, similar to that described in the instructions for creating a cooler bag in a car.
From the foam, you need to cut out the details of the bottom and sides according to the internal dimensions of the box. Styrofoam is perfectly cut with a wallpaper knife. To get a clean, even cut, you should use a metal ruler. The cut out parts must fit snugly against the planes of the box, any gaps are excluded.
According to the internal dimensions of the box, it is necessary to cut the foil isolon with an allowance of 4-5 cm for overlapping.
Next, line the box from the inside with foil isolone. Secure it with staples or double-sided tape. Seal all joints with foil tape.
By analogy, insulate the cover. The final dimensions of the lid foam panel must ensure a tight seal without gaps or play. For tightness around the perimeter of the lid, glue a window seal on the inside.
Install hinges and latches, paint the product on the outside with heat-insulating paint.

For fastening foam parts, you need to use acetone-free adhesives.

A home-made cooler bag made of polystyrene foam, polystyrene foam or a polystyrene foam bag of this design will retain the initial temperature inside the box longer.

Making a wooden box

Cold accumulators

Cold accumulators are needed to maintain the temperature inside a homemade refrigerator. There are several simple solutions this question:

Packed in sealed bags, ice does an excellent job. Problems can arise if the seal of the package is broken. Leaked melt water can spoil the food.
Water frozen in plastic bottles is a more reliable option. For slow melting of water, a saline solution is prepared in the proportion of 6 tablespoons per 1 liter of water. The disadvantage of this method is that such batteries take up a lot of usable space.
Gel from diapers is devoid of these shortcomings. The diaper is soaked in water. Then the gel is removed, which is placed in a sealed bag and frozen.
Gelatin or wallpaper paste is diluted in salt water. The jelly-like mass is laid out in bags and frozen.

If a independent production is not acceptable, then ready-made batteries can be bought at a tourist or online store.

Sealed ice

Woo from homemade device maximum efficiency will allow compliance with the simplest rules of operation and storage:

The entire internal volume is filled completely. The voids must be excluded.
Products are additionally wrapped in paper. Paper is a good thermal insulator.
From above, it is better to wrap the products with a newspaper or a towel.
When not in use, keep the cooler bag open to prevent mold and musty odors.

Following these simple tricks is guaranteed to keep the right temperature inside the box for 12 hours under the most extreme conditions. A do-it-yourself thermal bag will be a great helper in any life situation when you want to keep the original temperature of the food. Its manufacture does not require special skills, time-consuming and the acquisition of expensive materials.

Video

Many people are sure that a cooler bag is an expensive product, and only a few can afford to have it. Although on a hot summer day, going to nature or on a long journey, this thing would be very necessary. But such a household item can be made by yourself! Let's figure out together how to make such a bag at home. Believe me, it's extremely simple!

How to make it

It is no secret to anyone what the essence of the work of such a product is: it saves the vital cold. This happens approximately in the same way as a constant is maintained in a thermos comfortable temperature. How to make a bag with the properties of a refrigerator with your own hands? What do you need to prepare for this?

First you need to choose the right cover. In his role can be a sports or shopping bag. The main requirement is that it closes tightly, is well made and sewn from durable material. It's good to think ahead the right size products.

Advice! Consider how you plan to use the cooler bag in the future. If you need it for long walks, opt for small sizes. If such an item is needed in the car, its size can be any.

So, let's figure out what materials you need to purchase or just prepare for work.

Here is the main list:

the bag itself (for the case);
insulation covered with foil;
wide tape;
scissors.

Surely you have noticed that most of the necessary things are in every home. You need to buy only the heater itself. But where can you get it?

This insulation is widely used in construction. In addition to the fact that it retains heat well, it also has the ability to reflect it. It is this insulation that many people use in order not to release heat from their apartment. It is not uncommon to see it glued behind the batteries. So it's easy to buy. In addition, it costs almost a penny.

So, if all the items are ready, it's time to make your plans a reality!

Sewing instructions

First, you need to cast aside all doubts about the business you have started: you will definitely succeed, and you will be much more pleasant to use the product than what you would buy in a store.

For convenience, we will divide the entire workflow into several stages. In fact, everything is not as difficult as it seems. So, let's begin.

Stage 1: preparation

When all the items necessary for the manufacture of such a refrigeration appliance are ready, it's time to cut the insulation.

Calculate the bag size. Cut out a piece of polyethylene foam that resembles the shape of a cross, where its center is the location of the bag itself. Please note that you will have to put the finished insulation folded in a box inside the bag, therefore, the size of the pattern should be slightly smaller than the product itself.

At first glance, it may seem that the lid can easily bend and cover the bag. However, in order for it to fit as tightly as possible to the edges of the product, it is better to cut off the cover and fix it differently.

Tightness in the manufacture of such an item is the most basic rule. If at least in one place all the cracks are not closed with a heater, such a product will be unsuitable for use, since it will not be able to maintain the desired temperature.

Stage 2: gluing

Now we collect polyethylene, like a box. To secure the seams, we use not only adhesive tape. From the remnants of polyethylene, we cut out the strips, which we attach to the seams and fix. This will provide more complete thermal insulation, and the product will not let heat through.

We try to carefully glue all the seams, leaving no gaps.

Important! When assembling the insulation and gluing it, remember that the shiny side with the foil should look inward! Otherwise, the whole process will fail!

We attach the cut off cover with adhesive tape. So you can be sure that it will tightly close the refrigerator. Be careful when gluing the walls and seams. Don't feel sorry for the tape.

Obviously it's not that hard. The diagram helps to better imagine how to assemble the cut insulation into a box.

Stage 3: completion

Now we put the resulting box in a pre-selected case. Be careful not to damage the seams when transferring. It remains only to fill the remaining space between the bag itself and the heat-insulating insert. For this, cotton wool or foam rubber is suitable. So, your refrigerator is ready!

Without cold, there is no point in our refrigeration item. How to make cold storage? Ordinary water is able to hold the temperature, but only for a very limited time. For this, a saline solution is suitable for us.

We prepare the composition in the ratio: 6 large spoons of salt per liter jar.
Pour into small containers. Plastic bottles, heating pads or plastic bags for water will do.
Place them in the freezer to completely freeze.

Ice made from salt does not defrost as quickly and maintains the desired temperature better.

Other types of bags for keeping cold

Now let's mention a little about how to make such an item for one bottle. It may be that you just like to drink chilled water all day, and you do not need to keep food in the cold. Then a small model will be enough for you

To do this, let's pick up a case that repeats the shape of the bag.
If it is difficult to find one, you can sew it.
We cut out the heat-insulating material in the shape of a cylinder.
We glue the seam.
Cut out the bottom and lid.
We place the finished cylinder in the case.
We put a small accumulator of cold at the bottom, or we cool the bottle of water itself.

An equally interesting and useful product is made of foam. But you can watch a video about it. It tells in more detail what is needed for its manufacture, how to properly assemble parts and how to use it as efficiently as possible.

Let's look at some of the features of using such products that will increase their effectiveness.

If you properly made such an item, prepared high-quality cold accumulators, then it will be able to keep the required temperature for 12 hours.
Place the main batteries on the bottom of the product, but for better preservation of the cold, you can shift the products with additional batteries.
Try to pack the food in the bag as tightly as possible. Any remaining space not filled with food will help the refrigerator heat up quickly.
Do not leave the bag in direct sunlight - the cold storage period will decrease dramatically.
If your cold accumulators have melted, you can freeze them again. But in the ideal case, fill them with new liquid for a future trip.
Optimal temperature regime using such an object is about 20 degrees. However, at higher temperatures, it still retains its properties, just not for so long.

Now you understand how to make a cooler bag with your own hands. Obviously, this is not as difficult as it seems at first glance. In addition, the cost of such a product for your family budget was ten times lower than if you bought a ready-made one. Use, experiment, and let your bag please you and your family for a long time!

The video below shows how to make the same high-quality and useful bag, but only using foam instead of polyethylene foam.

Having made such an item with your own hands, you will never regret it. And all your outings in nature will be provided with delicious and fresh products, as well as clean and cool water. What else do you need for a good rest?!

Bag - refrigerator- it is also called a thermal bag, thermal container. The principle of operation of such a bag is that it is made in the form of a thermos and prevents heat from entering inside.

There are now many offers on the Internet for the sale of such bags of refrigerators, but their prices are not always democratic.

First you need to decide on the size of the future thermal bag, or rather, you need to choose a regular shopping bag of the right size or use a regular sports bag.

To make a bag - a refrigerator, we need:
- a bag
- foil polyethylene foam (it is also called isolon, teploizol, polyizol)
- Double-sided tape
- regular wide tape
- scissors

Foil polyethylene foam, you can easily purchase on the construction market. This material is not expensive, and we will not need much at all (one meter will be enough). It is only advisable to purchase with double-sided foil (so that not only does the cold not let out but also does not let in the heat) and at least 5 mm thick. (the thicker, the longer it will stay cold)

Now we proceed to cutting out polyethylene foam according to the size of the bag. The cutting process is quite simple, it's like gluing a regular box. Just do it in such a way that this box can easily fit into your bag. And when designing, do not forget about the cover.

Isolon is thick and is constantly trying to straighten up, so double-sided tape, which we glue around the perimeter, will be a good assistant in the manufacture of a thermal bag.

Glue the side walls.

The thermal container is ready, now it remains to additionally glue all the seams with a wide adhesive tape. The best way if you use aluminum tape for pasting the seams (you can find it on the building materials market, it is used for insulation), which will additionally provide thermal insulation of the seams, but this is already an additional cost.

We insert the thermal container into the shopping bag and get a refrigerator, which in its qualities will not be inferior to the purchased ones.

Now you know how to make a bag - a refrigerator with your own hands so keep it up.

The process of making a refrigerator bag took 30 minutes. And it cost about $5.

But let's not forget that this bag will not produce cold by itself. To create cold, it is necessary to place cold accumulators in the bag. As cold accumulators, ice is used, which was frozen on the eve in the freezer.

Plastic bottles can be used for freezing, but they are not very practical because they take up a lot of space and have a small area. For this reason, I recommend using plastic bags with a zip lock (Zip Lock), they are more compact and efficient.

For such a bag, I needed six Zip Lock bags, which I evenly distributed among the products.

Tests in the field showed that the ice in the bags after 12 hours in the heat had just begun to thaw. At the same time, drinks and food were chilled. But the main rule to keep the cold as long as possible is to look into the bag less often and close it tightly.