The Terrapin System is a holster-like mount with integrated RF welded drybag. The load can be quickly removed from the bike for packing/unpacking. With Indie-Rail, each saddle rail is cinched down hard to the sides of the bag, virtually eliminating side to side bag sway without the need for external hardware. Indie-Rail attachment system and active camming hardware - Super stable without added hardware Radio frequency welded drybag with air purge valve Protective external plastic bottom frame sheet Aluminum hardware at high stress points Composite internal top frame sheet Hypalon slots on drybag for rear light attachment Foam stiffened side panels with fiberglass compression stays