Waterproof bikepacking/urban-inspired seat pack bag that is quickly attached/removed via an ingenious quick-release system that fastens to standard seat rails. Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating. Hydracore liner provides an exceptional IPX5 waterproof rating. Attachment to saddle rails ensures compatibility with most carbon fiber seatposts suspension seatposts and dropper seatposts. Intuitive waterproof roll down closure system provides flexible load management. Outer bungee system allows excess gear to be carried outside of the main cavity. Ideal for unplanned loads faced by commuters. Polypropylene side stiffeners and dimensional foam top/bottom stiffeners provide additional load stability. Supplemental rear closure strap system provides additional support. Rear light clip