I have a plastic Deep Sea Supply BP with a small wing for travel. Single tanks don’t rock on them!
For cold water I have a 6 pound SS BP and a bigger wing.
As for pockets, I have a pair of OMS weight pockets, each has a zip pocket and a small velcroed pocket so everything except the compass is in a pocket, sausage, strobe, marker light, mirror, slate, Jon line aka deco hook, knife, back-up light and sometimes offshore a water bottle.