Sure Cotter & Davis invented the tumbler as a drinking vessel, but we’ve seen some of your alternate uses – a toothbrush holder, shrimp cocktail, vase - and they’re good! Submit your use, or feel free to borrow an idea!
 
Bottle Warmer
Use the shaker top lid on your 16oz tumbler to mix baby formula then place the milk in a bottle. Place the bottle in a 24oz tumbler (filled with warm water) to warm the bottle.