Ontwreckdiver
Contributor
I have a Sub Gravity 3mm aluminum backplate, 26 lb wing, adjustable harness, and drop down small weight pockets for my travel BC. The trim weight pockets are included and you can also get it with a one piece harness.
sub-gravity.com
For a non BP/W option, I would look at the Dive Rite Hydro Lite BC.
Hydro Lite BCD - Dive Rite | Equipment for Serious Divers

Paragon Single Tank Package - SubGravity
We understand what the active diver needs from a single tank rig. Simple, streamlined, balanced, and easy to travel. We built the Paragon single tank package to offer a modular and customizable BCD to best suit single tank diving needs. At the heart of the Paragon Single Tank Package is the...

Hydro Lite BCD - Dive Rite | Equipment for Serious Divers