Description of Outdoor Research Hydrolite Ditty Bag - Large Ditty bags are indispensable when it comes to organization in your pack or luggage, keeping smaller items identifiable and available. Avalanche beacons, your compass, a quick snack, or your backcountry bathroom remain separate, dry, and safe in these ultra-light dittys. It helps keep wet items separate from the dry and vice versa and maintains organization...and couldn't we all use that! Features: HydroLite is a coated nylon gossamer that is ultra-light and ultra-durable without sacrificing waterproofness. Through a full battery of laboratory and real world' tests OR could not find a better ultralight material.