OS-42. 1000D Cordura®. Super-tough Hypalon construction. Heavy-duty cam buckle fasteners. Removable internal white liner (taped-seam). Aircraft-grade black alloy hooks. Reinforced carry handle. Hi-visibility details. 100% waterproof roll-top main body - No rain cover required. Roll-top closure for total weather protection. 16 hook-on points for additional packs. Mounting and removing an OS-PLATFORM takes less than a minute with two quick-release straps and buckles. The same straps compress the pack firmly in position - No extra tie-down straps are required . Compatible Accessories (sold separately): OS-Shoulder Strap to carry off the bike. OS-Straps to mount using traditional 'over-the-seat' saddlebag format. Security cable.