The volume of the working chamber of the thermal bag. The
larger the volume, the more products can be loaded inside at a time. When choosing according to this parameter, it makes sense to select a model with a margin, because it is not recommended to load products too tightly — this adversely affects the quality of the device. On the other hand, note that the volumetric container and dimensions will have the appropriate ones.
The maximum time during which the temperature inside the thermal bag remains unchanged. The low temperature retention time is usually indicated when using the so-called. cold accumulators - pre-cooled blocks with water or other coolant. This parameter is quite conditional, since real time depends on many factors; however, it completely allows you to compare different models of thermal bags with each other.
Additional compartment outside the bag, designed for convenient storage of small items such as phone, keys, cards, cutlery, napkins, or tableware.
External compartments usually come with a zipper, Velcro, or clasp, allowing for quick and secure access to items without opening the main compartment where food or drinks are stored. These pockets can be made from the same thermal insulation material as the main compartment, or from a less insulating material, depending on user needs.
