COOLER AND YETI THIN ICE COMPATIBLE - Each Size Is Made To Stack, Pack, And Nestle Right In With YETI Thin Ice And YETI Hard Or Soft Cooler. LEAKPROOF & AIRTIGHT - Nothing Will Go In, And Nothing Will Come Out, Keeping Your Food Fresh Until It’s Time To Dig In. MICROWAVE & FREEZER SAFE - Feel Free To Pop It In The Microwave Or Store It In The Freezer Until It’s Time For The Next Venture. DISHWASHER SAFE - Because No One Needs More Work To Do. YETI Food Storage is primarily made of Tritan Renew plastic, with up to 50% recycled content in each container.