The Ortlieb Seat Pack Saddle Bag-Medium protects your essentials while you focus on reaching your next destination. Lightweight yet sturdy polyurethane-laminated ripstop nylon and heavy-duty fabric at the saddle rail mounting location offer durability Air-release valve makes it easy to purge the bag of trapped air, allowing for tighter compression Heavy-duty hook-and-loop seatpost attachment has a soft grippy surface for slip-free performance; it can be mounted to carbon seat posts Sturdy polyethylene inner stiffener Doubles as a mudguard Reflectors help you stay visible to motorists SPECS: 11L/671 cubic inches H/15.7 x W/10.2 x D/5.9 inches Weight: 11 oz. "
