Camping involves a lot of people. For this, they usually gather as a family, and then go by car to the forest edge or river bank in order to have a good rest in the lap of nature. At the same time, a problem of this nature may well arise: how to keep the products taken with you as long as necessary, and it is important that they do not deteriorate. For these purposes, special devices already exist: cooler bags and lunch bags. The first case involves the use of electricity accumulated in the battery of a cooler bag. It is this energy that makes the cooling mixture work.
Refrigerated bags are usually used to transport perishable products: prepared milk mixtures for children, butter, meat products, and much more. Thermal bags are designed to preserve hot foods. For example, you go on a picnic, for which you decided to order several pizzas. To prevent them from cooling down on the road, they are placed in special thermal bags, after which it is quite possible to enjoy the aroma and taste of a fresh dish.
A self-made thermal bag is an excellent way out of the situation for those who want to save a little on its purchase. Such devices are in great demand among employees of bars and cafes involved in the delivery of meals to offices. In a thermal bag, lunch remains hot and mouth-watering. And this is exactly what is needed.
If you are interested in how to make a thermal bag with your own hands, you should know that you will have to work hard. To begin with, it is important to understand that this device is similar to a thermos, only intended for solid food. And if this is so, then it is required to use several layers of dense fabric, which are separated by layers of substances with low thermal conductivity. As such thermal insulation, you can use ordinary air, which does not allow dishes to cool inside the bag. In such a device, all seams should be stitched with special care and with the obligatory use of a dense thread. It is the seams that most often are the source of losses of the bulk of the heat.
Do-it-yourself thermal bag can be made of a special foil insulation. If we are talking about a bottle, then you need to roll the material with the foil side inward, and bend one end to close the bottom. The edges of the joints should be superimposed for better thermal insulation. Such a thermo bag, made by oneself, is, of course, very primitive, but it allows you to retain heat inside. Joints are quite appropriate to fasten with glue, adhesive tape or a stapler, depending on what suits you best. You can make it look like an envelope so that you can put food inside. To do this, it is necessary to divide the strip of material into three parts, bend two of them to each other, fasten, and use the third as a valve. To make a thermo bag made with your own hands, securely close, you can stick a Velcro strip on the valve and base. The products in such an envelope will not deteriorate for a long time, but you will not need to carry excess cargo.
So, now you know how to make a thermal bag, it remains only to determine what size it should be.