Shipping cold packs from Grainger can keep perishable items at the right temperature during transport to help prevent spoilage. Cold packs feature moisture-safe plastic, filled with viscous gel refrigerant. Freezer packs contain foam refrigerant impregnated with aqueous solution. Both types help keep foods and medications at sustainable temperatures. Rely on Grainger to provide shipping cold packs in a wide range of sizes to help provide convenient cold shipping.