The Hydraulic from Sea to Summit is a super heavy duty dry bag, specially designed to withstand extreme conditions. TPU laminated heavy duty waterproof material. TPU roll closure does not trap moisture. Fully taped construction for permanently sealed seams. Durable UV-resistant, PVC-free material withstands cold temperatures. High performance, wear resistant material. Oval bottom keeps bags from rolling around. Practical, space-saving profile that is easy to stack. Loops for fastening.