After donning your backplate, harness and wing the order of donning the regulators and bottles is important. That's because in an emergency the long hose must be unobstructed during a handoff and not be entangled in other gear. First, if logistics allow then clip on the stage or deco bottles. Second, place the backup second stage necklace over your head so that the backup second stage falls high on your chest at your neck. Third, don the long hose and clip the primary second stage to the right shoulder D-ring until ready to place it in your mouth. If you can't clip the bottles first, then when clipping them on later you must take care not to trap the long hose under the bottle strap and the left shoulder D-ring. We've seen more than one diver trap the long hose if while sitting they lean far forward to clip bottles.