Use the Mack Strap Velcro to lock legs up over chest strap.

Then inflate Co2 pad for landing

A Suggestion for a compact air cussion landing is using a Co2 life jacket from an old jet or used Co2 life jacket easily compacable for free fall and easy to attach before the jump and with practice the ability to place it into position with some straps for the feet to hold it in place for landing and inflate by pulling the Co2 carrtrages. Also I suggest haveing elbow pads full face helmet in care a roll is a possability