Weather-resistant bikepacking/urban-inspired seat pack bag ideal for day-trippers or commuting trunk bag users who dont want to use a rack. Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating. 2 rubberized modular seatpost straps with CamLock ensure things stay tight while eliminating potential damage to clothing. Polypropylene plates below saddle ensure ample leg clearance even if heavily loaded. Supplemental rear closure strap system provides additional support. Heavy-duty seat rail buckle and straps pull up to tighten. Water-resistant stitched construction