Use the 15L Ultralight Dry Sack from Outdoor Research for ultra lightweight and waterproof gear storage. Fully seam taped with a waterproof roll-top closure, this dry sack will keep your belongings dry should they decide to take a swim. Although it weighs in at just 1.6 ounces, don't underestimate its strength or durability. The transparent materials also allow you to find the items you need without having to expose all of the contents to the elements.
Waterproof roll-top closure with lightweight TPU-coated webbing