With the onset of the warm season or when planning a long car trip, everyone faces the issue of food safety. There are many names in everyday life for containers that allow you to store food and drinks in a chilled state. Cooler bag This is just the tip of the iceberg, since technically these devices are divided into several categories depending on the principle of operation and design.
Many users mistakenly believe that everything soft bags with a foil cover are the same, but they are not. The correct choice of type thermocontainer depends on how long your products will remain fresh. In this article we will look at the correct names of the various models, how they differ from each other and what technical nuances should be taken into account when purchasing.
Understanding the difference between isothermal bag and a full-fledged thermoelectric refrigerator will help you not to overpay for unnecessary functions or, conversely, not to be disappointed in the simplest model during long trip. Let's define the terminology.
Main names and classification of products
First of all, it is necessary to divide all devices into two large groups: passive and active. The first group includes products that do not consume electricity and only slow down the change in temperature inside. They are most often called thermal bags or isothermal bags. They work on the principle of a thermos: multilayer walls do not allow heat from the outside to pass through, preserving the cold accumulated in advance.
The second group is active devices that connect to a 220V network or a 12/24V vehicle on-board network. Their correct name is car refrigerator or thermoelectric container. A Peltier element is installed inside them, which forcibly cools the internal volume. Sometimes such models are called car refrigerators, although this is more of a marketing name.
There is also an intermediate option, which is often confused with ordinary bags. These thermoboxes are rigid containers with thick walls, often used for transporting medicines or large volumes of fish. They have better thermal insulation than soft bags, but do not have their own source of cold.
- 🎒 Thermal bag - a soft container with a foil layer that requires cold accumulators.
- 🚗 Auto-refrigerator - an electrical device with compressor or Peltier element.
- 📦 Thermobox —a rigid container with a high degree of insulation.
- 🧊 Cold element —a sealed container with gel that freezes at low temperatures.
⚠️ Attention: Do not confuse ordinary “string bag” bags with a thin layer of foil with real isothermal models. The former will keep the cold for no more than 30-40 minutes, while high-quality thermal bags keep the temperature for up to 12 hours.
Isothermal bags: design and principle of operation
If you are looking for the name of cooler bags without an outlet, then this is it isothermal bags. Their design is based on a three-layer material structure. The outer layer is made of durable fabric (Oxford, polyester), which protects from moisture and mechanical damage. The inner layer is food-grade polyethylene, safe for contact with products.
Between these layers there is the most important element - thermal insulation material. Most often polyurethane foam or foamed polyethylene is used. It is the thickness of this layer that determines the energy efficiency class of the bag. The thicker the walls, the longer the low temperature remains inside. High-quality models also have a sealed zipper, often double, to minimize heat exchange with the environment.
It is important to understand that such a bag itself does not produce cold. It only slows down the heating. For effective operation, it is necessary to place cold accumulators (cooling elements) inside. Without them, an insulated bag turns into a regular backpack.
There are models with different numbers of chambers. Single-chamber ones are designed for products of the same temperature group. Double-chamber thermal bags allow you to separate, for example, frozen meat and chilled drinks, which significantly expands the functionality of the device.
Active refrigerators: thermoelectric and compressor
When it comes to complete cooling on the go, auto-refrigerators. They are divided into two main types based on their operating principle. The first type is thermoelectric models operating on a Peltier element. When current is applied, one side of the element cools and the other heats up. Such devices are lightweight, silent, but have low efficiency at high ambient temperatures.
The second type is compressor refrigerators. These are mini copies of home refrigerators. They are capable of freezing food down to -18°C and do not depend on the temperature outside. They are often called mobile refrigerators. The main disadvantages are the high price, weight and sensitivity to tilting (although modern models do not have this disadvantage).
When choosing between them, it is worth considering the duration of the trip. For short trips to the country, a thermoelectric model that can only maintain cold is suitable. For expeditions and life in a motorhome, it is the compressor unit that is needed. thermoelectric model that can only maintain cold. For expeditions and life in a motorhome, a compressor unit is necessary.
What is an absorption refrigerator?
This is the third type of autorefrigerator, running on gas or from the network. They are silent and economical, but difficult to maintain and sensitive to vehicle roll. Found mainly in expensive campers.
Accessories: cold elements and their types
The key element for the operation of passive systems is cold accumulators. People call them differently: “icies”, “refrigerators”, “freons”. Technically, these are sealed containers filled with a substance with a high heat capacity. Most often, there is a saline solution or a special gel inside, which freezes at temperatures below 0°C.
There are several types of cold elements. Plastic saline containers are the most common. They hold temperature for a long time, but can be heavy. Gel batteries are more flexible and lighter, but they thaw faster. There are also dry cold packs that are activated by water, but they are more likely intended for one-time use or emergency situations.
For maximum efficiency, it is recommended to use cold packs that have been previously frozen in the freezer of a home refrigerator for 8-10 hours. It is important to place them evenly: on top, below and on the sides of the products, since cold air goes down.
| Cooling element type | Average operating time | Features |
|---|---|---|
| Saline solution | up to 24 hours | Heavy, keep cold for a long time |
| Gel | up to 10 hours | Lightweight, plastic, freeze quickly |
| Silicone | up to 6 hours | Reusable, flexible |
⚠️ Attention: Never use regular ice in bags instead of special ice packs in sealed bags. Melting ice can break the seal of food packaging or damage the inner coating of the bag.
How to choose the right thermal bag for different tasks
The choice of model directly depends on how you plan to use it. For a trip to the store or a short walk to the park, a small one is enough lunchbox bags volume 5-10 liters. It is light, compact and inexpensive. It is convenient to put sandwiches and drinks in it for an office lunch.
For a family picnic or a trip to the beach, the optimal choice would be a thermal backpack bag with a capacity of 20-30 liters. The backpack is more convenient to carry, as your hands remain free. Pay attention to the presence of pockets for devices and cup holders. The hard bottom of such a bag provides stability and additional thermal insulation.
If your goal is fishing or purchasing groceries in another city with subsequent long-term transportation, you will need thermobox or a bag with thicker walls (up to 30 mm). In such conditions, the volume and the ability to install a large number of cold elements are critical.
☑️ Criteria for choosing a cooler bag
Don't forget to check the quality of the seams. In cheap models, the needle can pierce all layers, creating “cold bridges” through which heat quickly penetrates inside. Sewed and taped seams is a sign of a high-quality insulated bag.
Rules for the use and care of thermal bags
In order for thermal bag to serve for a long time and effectively maintain the temperature, you need to properly care for it. After each use, it is recommended to wipe the inner chamber with a damp cloth and mild detergent. This will prevent the growth of bacteria and the appearance of an unpleasant odor, especially if you transported meat or fish.
The bag should be stored flat, with the zipper open. This is necessary so that the material of the inner layer “breathes” and does not rot. Folding a wet bag and putting it away in a closet can cause mold to form on the fabric, which is very difficult to remove.
Do not expose the bag to direct sunlight for long periods of time when it is empty. Ultraviolet radiation destroys the structure of plastic and fabric, reducing their insulating properties. Also avoid contact of the inner layer with sharp objects that can damage the seal.
Check the condition of the zipper regularly. If it starts to jam, lubricate it with a special compound or regular wax (rub the teeth with a candle). This will extend the life of the lock and ensure a tight fit of the doors.
Comparison of characteristics of popular models
When choosing between different brands, consumers are often lost in the names. Models from domestic and foreign manufacturers are presented on the market. The main differences lie in the materials and fittings used. European brands often use more environmentally friendly, but less wear-resistant materials, while Asian manufacturers rely on durability.
An important parameter is the cold retention time. Manufacturers usually indicate two values: the cold retention time (with a full load of cold elements) and the heat retention time. For the summer period, we are interested in the first indicator. A high-quality bag should keep the temperature for at least 8-10 hours.
Pay attention to the presence of additional functions. Some models are equipped with USB ports for connecting a power bank (for bags with ventilation), built-in thermometers or even Bluetooth sensors that transmit temperature information to a smartphone.
Do not chase the maximum volume if you do not plan to fill it. The empty space in the bag is filled with warm air every time you open it, which speeds up the heating of food. It is better to take two medium-sized bags than one huge one.
Can a thermal bag be washed in a washing machine?
It is strictly not recommended. Aggressive mechanical stress and high temperatures destroy the adhesive layer connecting the fabric and insulation. In addition, the tightness of the inner layer may be affected. It is only allowed to manually touch the walls of the outer cover (if it is removable) or wipe the inside.
How many cold elements are needed for 10 liters of volume?
The optimal ratio is 1 kg of cold elements per 10 liters of bag volume. However, if the products are already chilled, you can reduce the amount to 0.5 kg. If you are loading warm products, the amount of ice needs to be increased, but the efficiency will still be lower.
What is the difference between an insulated bag and a regular one?
The main difference is the presence of a layer of thermal insulation (polyurethane foam or analogues) and a sealed inner layer. An ordinary bag may have a foil lining, but without a thick layer of insulation it will not be able to maintain the temperature for a long time, working only as a heat reflector for a short time.
How long does a cooler bag keep cold?
The time depends on the quality of the bag, the number of cold elements and the ambient temperature. On average: budget models keep cold for 3-5 hours, high-quality branded ones - up to 12-15 hours, and thermal boxes - up to 24 hours or more if used correctly.