6 1/4 x 6 x 1" - 16 oz. Ice-Brix® Packs. Gel Packs keep contents cool and help protect the environment at the same time! Manufactured with polyethylene film that degrades into water, carbon dioxide and biomass. No heavy metals or residues remain. Sustains an 12 month shelf life if stored properly (temperature does not exceed 86 degree F and there is no direct UV exposure).