Waterproof, bikepacking/urban-inspired seat pack bag that is quickly attached/removed via an ingenious quick-release system that fastens to standard seat railsOceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coatingHydracore liner provides an exceptional IPX5 waterproof ratingAttachment to saddle rails ensures compatibility with most carbon fiber seatposts, suspension seatposts and dropper seatpostsIntuitive waterproof roll down closure system provides flexible load managementOuter bungee system allows excess gear to be carried outside of the main cavity. Ideal for unplanned loads faced by commutersPolypropylene side stiffeners and dimensional foam top/bottom stiffeners provide additional load stabilitySupplemental rear closure strap system provides additional supportRear light clipSeat post11.8x5.5x4.7 366 c.i.BlackX-Large (301-500 c.i.)