Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating Water-resistant stitched construction Heavy-duty seat rail buckle and straps, pull up to tighten 3 rubberized, modular seatpost straps with Camlock, ensure things stay tight, while eliminating potential damage to clothing Top mount bungee system with wings, provides optimum stability to top loads, etc Top bungee system for additional, flexible storage Supplemental rear closure strap system provides additional support Ultra-visible rear 3M triangle logo Polypropylene plates below saddle, ensure ample leg clearance, even if heavily loaded Built-in U-lock holder and rear light clip Seat post 18.1x 8.3x6.7� 811 c.i. Black XXX-Large (700+ c.i.)