This 3-Liter Dry Bag That Folds Up To Fit On a Keychain Is Basically Made for Dads
Ultra-Sil Dry Bag | Sea to Summit
3 Liter Waterproof Dry Bag - Walmart.com
Amazon.com: 6 Pieces Waterproof Dry Bag Set Dry Sacks Lightweight Airtight Combo Set with 20 L 15 L 10 L 8 L 5 L 3 L Sacks and Long Adjustable Shoulder Strap