Polar pack these gel packs are ideal for use when rigidity or reusability are required while also providing a more reliable shape when frozen as compared to flexible film gel packs. Nontoxic robust and resistant cold pack, rigid hdpe thermal (bottle form) cold pack offers excellent performance in terms of resistance to breakage and compression. Reusable & designed to maintain products at refrigerated temperatures throughout the cold chain, the gel bottle provides resistance to breakage and compression. Used for refrigerated transport of vaccines, pharmaceutical products, reagents, serums, insulin, samples and other heat-sensitive products that need to be transported at controlled temperatures.