Many divers use a 6' sausage, 60# open or 80# closed in the backpad of the backplate typically with the clip clipped to the butt dring with no problems. How you fold it is key however. Wetsuit, drysuit, drygloves, no suit... no problems and it doesn't dig into your back... again folding technique is key. 3' sausages can be prerigged to a spool and stored in a thigh pocket. You can find a great photo sequence on how to fold liftbags on www.ontariodiving.com.
When I've been without pockets (warm water dives) putting the spool or SMB on the butt or even left hip dring seems a better option than the chest. But don't forget to touch check it a couple times during the dive. Anything clipped to the chest tends to get in the way when going through doorways of wrecks or getting close to take a macro photo on the reef.
When I've been without pockets (warm water dives) putting the spool or SMB on the butt or even left hip dring seems a better option than the chest. But don't forget to touch check it a couple times during the dive. Anything clipped to the chest tends to get in the way when going through doorways of wrecks or getting close to take a macro photo on the reef.