Very often in everyday life such a device as a thermobag is required. It is used to keep food hot or cold. After all, thermoses are mainly designed for liquids, and sometimes you need to bring hot pies or a baked chicken. And in summer, on the contrary, care should be taken about the freshness of meat or dairy products. How to do without a cooler bag!
DIY cooler bag
You can, of course, purchase this little thing in the store. However, it may not be affordable for another. But there is a way! A stitched cooler bag with your own hands is practically not inferior in functionality to a factory product. After all, the main element of this device is the isolation of the interior of the object from external temperatures. And polystyrene, which is laid out in a regular shoe box with a lid or a cardboard case from a laptop, can serve as an excellent material for achieving these goals. Do-it-yourself cooler bag is made quite quickly and without financial costs. One drawback of this little thing is the small internal volume.
Picnic cooler bags
In order to be able to export more products to nature, you can use another method of its manufacture. The master will need a roomy bag, you can take a regular sports bag or backpack. Then, a lining heat insulator is cut out and sewn from the old down jacket or blanket, which should easily go inside.
How to make a cooler bag with your own hands
For greater aesthetics and improving the quality of things, you should buy foamed polyethylene with glued foil. A "cross" consisting of four connected rectangles is cut out of the insulation. The bottom of the bag is laid at the base, walls are adjacent to its sides. The pattern is made a little less than the volume of the bag itself so that the inner box from the insulation easily fits into it. It is best to cut the lid separately by gluing it at the very end, since the foamed polyethylene does not bend well. The rectangles remaining after cutting are bent in half and installed at the corner-joints, thereby creating a second layer of insulation.
The fastest and easiest way to make "thermal transfer"
Our grandmothers offer their own version of how to make a cooler bag with their own hands in old books of tips for young housewives. Two containers are put in a thing, you can even take ordinary pans. One should easily enter the other so that there is a hollow space between the walls. Between the bottom and the walls of the inner tank and the outer one they make a lining of insulating materials: wood, foam, fluff. Previously, common sawdust or shavings, hay or straw, crumpled paper were widely used . The products are folded already frozen or warmed up to the desired temperature (either one or the other). To enhance the effect, it is recommended to put inside the "refrigeration unit" - a piece of ice in a dense bag. And it is best to use metal cans of beer or Coca-Cola, in which metal parts are preliminarily superimposed: nails, bolts, nuts. Then water is poured and the whole structure is frozen. Such a device will give off its cold for a long time, and it will not leak when defrosting.