YETI Thin Ice Hard Ice Substitute is a groundbreaking innovation designed to be nearly 50% slimmer than YETI ICE and engineered to completely replace the need for regular ice inside your Hopper Soft Coolers and Daytrip Lunch Bag and Box. That way, you don't have to choose between saving space and keeping your goods fresh for as long as possible. Even more, it's built to be lightweight so you won't feel held back when you're trekking through puddles or hiking up hills.FeaturesImpact resistantFreezes fastNo messy cleanup DimensionsSmall 5" x 3.6" x .9"Medium 7.3" x 5" x .9"Large 10" x 7.3" x .9