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bubble blower:I guess my main concern is this...if I want to be vertical while at depth (not while swimming but to take a photo) will a back inflate or transpac allow me to do this with out to much work to stay in that position? Ultimately, I'll probably look into what justleesa suggested and look into trying a back inflate first.
Fit a crotch strap!! I use the TranspacII with the travel wings and I love it. I had the same problem with it riding up at first - but I got the crotch strap and now it's fine.Gilligan:Rick has laid out a great explanation. I am a warm water diver and use a single aluminum 80 all the time. I have used a backlift BCD for years. I currently use a Seaquest Dimension (discontinued). I don't keep up with the replacement names. I love backlift BCD's. My only complaint with it is that it rides up on me. It has only the Velcro cummerbund.
Many times I have thought of rigging a crotch harness to it or getting a setup that has one.
jcclink:Do what is comfortable for you.