The Hydraulic Dry Pack is a super heavy duty dry pack ideal for river running and canyon runs. Whether hauling gear through an airport, portaging on a paddle tour, or carrying equipment in the field, the EVA foam and air mesh harness will deliver ventilated comfort for small or large loads. The removable harness attaches to compatible Hydraulic Dry Bags with strong, lightweight aluminum buckles.Sea to Summit Hydraulic Dry Pack + Harness 35L Features: 600D TPU laminated heavy duty waterproof fabric UV resistant PVC free fabric withstands cold temperatures Non-wicking TPU roll-top closure with an innovative interlocking profile that is secure and waterproof Welded construction for permanently sealed seams Welded durable TPU lash patches for carrying gear or securing the pack Waist strap (35L) or hip belt (65-120L) for added support 7075-T6 anodized aluminum buckles (Field Repair Buckles on shoulder straps and hipbelt) are robust and fail safe Fully adjustable back length and height adjustable sternum straps Low-profile attachment points to reduce snagging when the harness is not attached The harness system is easy to put on and take off. Screen-printed diagrams on the welded patch show the herringbone pin/harness removal steps 35L size has a 25mm webbing waist belt Features the patent-pending, one inch (25mm) Field Repair Buckle with stainless steel pins