Sea to Summit Hydraulic Dry Pack 600D, TPU laminated heavy duty waterproof fabric withstands cold temperatures and is PVC-free Easily removable padded hip belt helps support the load when the pack is filled (waist strap on size 35L) Air-mesh / EVA foam shoulder straps are easily adjustable for length / easily removable Welded construction and non-wicking TPU roll top closure with interlocking profile provide waterproof performance Four welded Hypalon lash patches for easy attachment to a raft / portaging of external loads