The ALPS Mountaineering Clear Passage Series offers abrasion resistant mid-weight dry bags constructed of durable waterproof TPU material, and 420D nylon TPU coated bottom, with fully welded seams. The bag's superior construction along with a secure roll-top closure locks out water and offers a tenacious water barrier in wet environments. An oval-shaped, flat bottom helps the bags stand up on their own and make them easy to fill. A D-Ring attachment point is included for additional gear lashing, stacking, or attachment to your water craft. The most adventurous can't go wrong with the Clear Passage Series.