Ice Packs
An ice pack or gel pack is a portable bag filled with water, refrigerant gel, or liquid meant to provide cooling. They can be divided into the reusable type, which works as a thermal mass and requires freezing, or the instant type, which cools itself down using chemicals but can only be used once. The instant type is generally limited to medical use as a cold compress to alleviate the pain of minor injuries. In contrast, the reusable type is used as a cold compress to keep food excellent in portable coolers or insulated shipping containers to keep products cool during transport.
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