Revelate Designs Spinelock Seat Bag Locked and Loaded Revelate set out to create the most stable, low-profile mounted, feature-loaded, waterproof seat bag available, and the Spinelock checks every box. A patented three-piece attachment system, built around a forged aluminum saddle clamp, integrated "Spine" baseplate, and quick-release pin, completely eliminates the side-to-side sway that plagues traditional strap-mounted seat bags. If you want a bag you can pack once and stop thinking about, the Spinelock is it. Features Spinelock stability system completely eliminates side-to-side sway Forged aluminum saddle clampforms a quick-release pin interface for effortless bag removal Two mounting positions accommodate seatpost setback and saddle adjustments One-way, low-profile air purge valve compresses the load for a tighter, more stable pack Internal plastic structure and external skid plate add shape and durability on rough terrain Top-mounted webbing and bungee deck for additional external storage Rear light mounting slots for added visibility on the trail or road100% waterproof construction keeps contents dry in any conditions SPECIFICATIONSIntended Use Bikepacking, Touring Attachment Spinelock quick-release clamp and pin system Material210 Denier Ripstop Nylon with dual coated TPU, urethane based Hypalon reinforcement fabric, UV-stabilized, impact resistant nylon resin, forged aluminum Closure Roll-top with one-way air purge valve Compatibility Traditional saddle rails only, not designed for use with dropper posts Installation Torx-25 wrench required SIZINGVolume10 L16 LWeight22. 5 oz24 oz Minimum Tire Clearance8"9. 5"Minimum Exposed Seat Post6. 5"6. 5" | Revelate Designs | Spinelock Seat Bag | Black | 16L | Nylon