- small bag for all your essentials that you want to keep dry
- waterproof bag with roll-down closure
- about 2 liters (1/2 gallon), diameter 115mm (4.5") x 215mm (8.5") tall (closed)
- only 80 grams (2.9 ounces)
- bag has a small carabiner hook

 
Bags with roll-down closure are not suitable for prolonged submersion. Don't use as a flotation device.