Saddlemen BR1800 Sissy Bar Bag Two mounting systems included in Saddlemen's Versa-Mount under-seat yoke and harness or an adjustable sissy bar strap system that easily attaches bag to your motorcycle's seat, luggage rack or sissy bar Backrest pad can be adjusted for additional comfort for the passenger or driver Include detachable backpack straps for easy off-the-bike jaunts Include another large top-loading main compartment Padded storage compartment and organizer pocket Five external pockets, two of which can be expanded for added capacity Five internal and two outer mesh pockets Rain cover with security tether protects the bag from the elements Top exterior flap can be adjusted to carry a jacket Mini-padlock, with extra keys, help secure your belongings in the bag Internal structure maintains bag shape even when empty Rigid internal structure is strong enough to lean on even when bag is empty BR1800 measures 15 in. H X 11 in. W X 10 in. D (1,800 cubic inches cargo capacity) and holds one 3/4 helmet plus other cargo