Gel Refrigerant Packs 0ºC (+32ºF) are an economical alternative to wet ice commonly used as cold packs in conjunction with insulated shippers for transporting laboratory specimens. Enclosed in a durable 4.1 mil polyethylene film, gel refrigerant packs provide reliable refrigeration for safe transport without leaks or spills which would contaminate your product. Choose from the various sizes in the ordering table below.