Heavy duty, clean, functional design, durable performance and plenty of space to keep your gear protected anywhere you ride. Made of 500 denier PVC with welded seams. Padded back support and cushioned adjustable straps with sternum clips provide all-day comfort. Secure and easy-to-use roll top 2-way quick clip closure for added versatility. Outside zippered pocket for stashing keys, ID or other easy access stuff. Secure it to your seat or rack with the sturdy D-rings. Reflective trim keeps you visible when riding at night. 25 Liters (16"x11.5"x6") or 35 Liters (20"x12.5"x6"). Black.