Blackburn Outpost Elite Universal Seat Pack and Dry BagThe Blackburn Outpost Elite Universal Seat Pack and Dry Bag is finally compatible with both standard and dropper seatposts. There is a T6061 Alloy Wing that goes under your saddle. The other part is the removable and waterproof dry bag. This bag has a scuba-style air bleed valve to keep items confined and remove bulk easily. The aluminum hardware is durable and prevents your gear from swinging back and forth. Package includes harness, bag, and hardware. The load capacity is 10.5lbs/4.76kg. The setup weighs 572g.768686167768