At SeriousMaleBondage they call this rig the ‘flip-flop’ device. Created by their resident inventor Dalton, it uses a suspended Maxcita sleepsack. The subject can be oriented either face-up or face-down. Both positions are quite relaxing and lend themselves to long-term confinement, especially since the head is completely supported. Once the subject is fully secured, he is monitored remotely from their office by a video link.
See the FULL VIDEO at SeriousMaleBondage.com
Title of this video: Mister X Double Bag Flip Flop
I spent some time in that. It was surprisingly relaxing and comfortable, either up side or down side.