Bikepacking inspired urban adventure bag with the volume capacity of a trunk bag without the need for a rack Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating Hydracore liner provides an exceptional IPX5 waterproof rating Universal Rixen & Kaul CONTOUR MAX seatpost bracket with 2 sets of seatpost clamps (25-32mm & 32-36mm) 8mm Engineered aluminum frame provides stiffness and load stability *Not advised for carbon fiber or ultra-lightweight seatposts Intuitive waterproof roll-down closure system provides flexible load management Front external mesh pocket with Velcro closure Outer bungee system with wings, allows excess gear to be carried outside of the main cavity Polypropylene side stiffeners and dimensional foam top/bottom stiffeners provide additional load stability Supplemental rear closure strap system provides additional support Built-in U-lock holder and rear light clip Seat post 17.3x7.1x6.3` 732 c.i. Black XXX-Large (700+ c.i.)