This is what I found on eBay:
The description says:
Body shaped bondage bag with elasticated neck and waist. No arms, so arms trapped within the bag with side entry zip. Breathing tube on enclosed head. Side port with small pipe attachment for connection to standard vacuum cleaner. Once that vacuum is on your going nowhere! Comes with attachments.
Made by Kunzmann.
Unlike vacuum beds the vacuum bag looks much safer, because of the mobility. Not sure if the breathing tube safe enough, though. It’s not shown on the picture.