Tundra Series is a portable, safe, and re-usable alternative ideally suited to replace dry ice. Arctic Ice™ Tundra Series works best when frozen for 36 hours at the lowest setting available on consumer freezers. (What takes longer to thaw, takes longer to freeze.) The purple interior turns white when fully charged. For extended storage periods, the cooler should be packed full of frozen goods and rarely opened.
Large - 2.5lbs - 7.5" x 9.5" x 1.25" Use large size to keep a medium sized cooler of frozen goods frozen.
Extra Large - 5lbs - 10.925" x 8.661" x 1.85" Use these five pound panels to keep larger coolers frozen instead of dry ice.
Follow the link for a great introduction to the Tundra Series of Ice Replacement Packs.