Providing Durable Water Resistant Protection For Your Gear, The Stash Pak* Roll Tops Are Built To Survive Harsh Conditions. Both Bags Provide Detachable Straps For Easy Portability, 4 D Rings For Securing Anywhere, And A Detachable Pouch For Small Essentials. The Stash Pak* Roll Tops Come In Two Sizes, 20 Liter (Ae3507) And 40 Liter (Ae3508) And Pack Into The Detachable Pouch For Compact Storage When Not In Use.