The Blackburn Outpost Elite Universal Seat Pack and Dry Bag. Blackburn developed their Outpost Elite Universal Seat Pack USP to work with dropper or standard seatposts be able to carry a bevy of cargo and be stable enough to not swing around while it does. The USP is a two-part system Part 1 is a T6061 Alloy Wing that affixes to your saddle and works with a standard or dropper post. Part 2 is a removable and waterproof dry bag. The bag has a scuba-style air bleed valve to assist with compression while off the bike. The wing stays on the bike the bag comes off and allows you to pack compress and go ride in the snap of a few buckles. Weight 572 grams. Aluminum Innovative aluminum frame provides a stable platform for your extra gear in addition to providing more security and rigidity. Capacity 10.5L. Volume Holds up to 10.5lb4.76kg. Compatibility Works with standard or dropper posts. Installation Wing mount keeps your load from swaying during pedaling. Water Resis…