Innate Mentor Organizer Sac Combo (2L, 3L and 5L) - 2012 Roll-top access with durable side release buckle gives a waterproof closure on the two-dimensional panel construction Stitch less radio frequency welded seams will keep contents drier longer and are much more durable than conventional seam tape which is used on many comparable ditty bags Translucent recycled urethane front window for locating contents at a glance Patent pending O2-Flow one way compression valve easily and quickly removes excess air; The valve is protected by an lightweight internal housing that will stay flexible in cold temperatures Lightweight 30 denier fabric with double sided water-proof treatment won't leak or become saturated in wet conditions; The exterior has a water repellent coating while the inner side features a durable urethane laminate which has increased water resistance and durability