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Pretty much any donut-type BIU with a VDH-type backplate and standard straps works well as long as the DH cans fit snug against your back and between your shoulder blades. Stick the top of the BIU between the cans and the tank. Horsecollar BC's of course but those, IMHO, suck.I have not found any jacket-style or other type that permits a DH to be positioned correctly for optimal breathing. My 2psi. Good luck!
The 2 I have are old enough they were store brand re-labels, lol. I also have a template for a backplate I cut from a plastic cutting board that does well with a wing and basic harness.Thanks, remember the Zeagle model?