Saekodive has 2 systems. They have the Glide 25 and the Glide 45. The 45 is for twin tanks, best for twin aluminum 80's or nothing bigger than steel 100's. There is an option of an aluminum backplate or a 4 pound stainless steel backplate. Harness is included. The Glide 25 also comes with 2 cam straps for tanks because this is a single tank system.