Insulated shipping containers are boxes for highly sensitive products or anything where high-temperature sensitive shipment could cause shipping difficulties. Our insulated container kits consist of an expanded polystyrene (aka Styrofoam) cooler inside of a white corrugated shipping box which is marked "RUSH perishable". These provide excellent insulation for longer transit time shipments. Ship safely and maintain the insulation and integrity of your products with our lightweight, reusable, and recyclable insulated shipping boxes. Add Brix Cold Packs to keep perishables at a constant and desirable temperature for days or extend your shipping times. The ultimate in refrigerant packs. Leakproof, reusable and economical to use. Specially formulated with food safe, non-toxic materials that stay colder than ice.