These BCDs are very comfortable and provide increased agility for side mount BCD and light carry--note, air cell provides 23 lbs lift. Note, this is a single bladder model with the inflator hose coming up from the bottom of the back. I took a number of "up close" shots including back pockets and model information to show condition, which is very good. The bottom inflator hose is a nice feature for some people.
It's a personal preference; I've used both and actually prefer this configuration when using the SMS 50 Sport. Non-Traditional lower back inflator routing, built-in trim pockets - 3lbs (pair) located on inner Wing, removable shoulder pads. Air cell - 23 lbs lift, rugged 1000 denier Cordura, side mount only harness, one size fits most, system weight 5lbs. Full visibility over your system - tanks, valves, Regulators all within eyesight and adjustable at depth. Reduces additional gear: doubles bands/hardware/manifold - Benefit when traveling. The item "Hollis SMS 50 Sport Side Mount, Bottom Mount Inflator Hose" is in sale since Friday, February 22, 2019. This item is in the category "Sporting Goods\Water Sports\SCUBA & Snorkeling\Buoyancy Compensators".The seller is "dmrockwell" and is located in Saint Petersburg, Florida. This item can be shipped to United States.