NRS 2.2 Bill's Bag Dry Bag Constructed with 21-oz PVC/polyester body with a 34-oz round bottom Expandable for over 3800 cubic inches of storage capacity but can be cinched down with four compression straps to compact and stabilize gear The adjustable backpack harness has a rubberized grab handle and extra wide padded shoulder straps for comfortable hands-free transport your gear The StormStrip closure system provides a confident seal and allows for easy top loading access Integrated padded backpack straps