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To heat a meal, the bag is first torn open, and a sealed food pouch is placed inside. About 1 US fluid ounce (30 mL) of water is then added to the bag, using the line printed on the bag as a marker. The chemical reaction begins immediately, and takes about 12 to 15 minutes to heat a food pouch to about 60 °C (140 °F).
Thermally insulated bag with ice packs Example of a thermal bag Example of a thermal bag. A thermal bag is a type of thermally insulated shipping container in the form of a bag which can be carried, usually made of thermally insulating materials and sometimes a refrigerant gel. It is used to help maintain the temperature of its contents ...
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This mechanism allows portable heat wraps to maintain their heat for the entire 90-minute application, compared to conventional silicate-gel hot packs that start to lose heat at 15–20 minutes. Similar to silicate-gel hot packs, the average temperature increase of the paraspinal muscles is 2.2°C, at 1.5cm depth and 1.1°C at 2cm.
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