4-3/4 inch x 7-1/2 inch x 3/4 inch (12.1 x 19.1 x 1.9 cm). Just freeze and use over and over. Colder than ice. Long lasting. Safe, non-toxic. Leak proof bag. Helpful Hints: Pre-cooled food will stay colder longer with Freez Pak; Stacked Freez Paks keep food cold the longest; A small chest, fully packed, will stay cooler longer than a larger, partially loaded chest. www.lifoam.com.