The purpose of the thermal bag is to keep food fresh for longer and drinks cool. But the thermal bag itself does not cool the food! It only keeps the cold, so the contents in it must be chilled or frozen.
What is a thermal bag
It is a heat-insulated product that keeps you cold or warm.
A good insulated bag uses dense polyethylene foam inside and the capsule is made of water-repellent aluminum foil. This combination of materials keeps the temperature at the same level for hours, even in the heat.
Budget models are sewn from several layers of waterproof material. The outer is made of polyester with a water-repellent PVC coating, and the inner is made of foil-clad polyethylene. These thermal bags are water-tight, heat-dissipative and easy to clean.
If you buy a bag, take cold accumulators with it. These are hard or soft boxes filled with water and saline solution. The mixture freezes in the freezer, heats up in boiling water. Such briquettes keep cool or warm 2-3 times longer, provided that the volume of the bag is correctly calculated by the number of batteries. If you do it right, the inside temperature will be 15 ° C lower (higher) than outside. Place them on top of groceries and on the sides of your bag.
How many cold accumulators are needed for a thermal bag
One battery for three liters of bag volume.
As for the question: “How long does the cooler bag keep the cold?” - depends on the degree of cooling of the products and materials of the bag.
- Cooled, but without cold accumulators inside - 1-3 hours.
- Cold briquettes - up to 10-15 hours. Some manufacturers (Thermos Geo Trek, Pinnacle Eskimo, Igloo) promise up to 20 hours.
How to use a thermal bag
- Food is cooled (heated), cold accumulators are frozen (heated).
- Packed tightly with food and distribute boxes on top and sides.
- Close the zippered bag and zippers to prevent the loss of cold or heat.
Watch the video how to make a cold accumulator at home
Refrigerator bag which is better - large or small
Everything is simple here: what needs, so is the demand.
- For a large company - a large bag with a volume of 26 liters or more. It is roomy. The straps and handles are soft, do not chafe palms and shoulders, so it is comfortable to wear.
- Lunch bag is a mini fridge designed for home meals and snacks in the office, at school, or on a walk.
- The thermal backpack will not pull off the hands, put it on the shoulders and order. Depending on the model, the volume varies between 16-25 liters. Looks like a city backpack, but roomy.
- Thermoboxes, like bags, keep the temperature, but they can be washed. Plastic dries faster than PVC materials.
Cooler bag: reviews
Katya left a review about the Time Eco TE-334S thermal bag: “The fabric is dense, keeps its shape well, does not fall apart, the handles are sewn on conscience. They took frozen berries and fruits from the dacha home in it, nothing flowed».
Ludmila writes about Geo Trek: “The thermo bag with a volume of 20 liters holds 6 bottles with a capacity of 1.5 liters. Instead of ice packs, 2 frozen 1.5 liter bottles were used. Even on the second day, the drinks remained cool. I often use a bag to transport milk, cheese, feta cheese from village to city. Despite the hot summer, milk is stored in the refrigerator for 5 days without boiling.».
Elena, Camping Mega Picnic: "Even without batteries, frozen meat does not leak for 3-4 hours! It keeps the temperature very well. Lightweight, durable seams, weight tested».
Interesting article: "Ceramic knives: pros and cons"
Watch the video life hack how to make a thermal bag yourself
