SiOnyx 20 Liter Waterproof Dry Bag Black. Made of sturdy waterproof vinyl with a structured bottom and adjustable straps this bag will protect it all against water and sand from a change of clothes to your wallet and cellphone. Or fill it with ice and a six-pack of your favorite water-side beverage for a lightweight cooler Specifications for SiOnyx 20 Liter Waterproof Dry Bag: Manufacturer: SiOnyx Color: Black Fabric/Material: 500D PVC Pack Volume: 20 liters Height: 23.5 in Package Contents: SiOnyx 20 Liter Waterproof Dry Bag EA- 9.5" x23.5" Unfolded PK- SiOnyx 100009: 20 Liter Waterproof Dry Bag Black