I read somewhere while I was looking up kit ideas for 2 piece MAVs that someone had got their hands on a sort of back panel that spanned the gap where the adjustment strap was. It attached to either side of the mav with molle. They used it to more securely attach a hydration pack instead of the standard 'use a couple of zip ties' approach.
Does anyone make these, or is this a custom thing only?
It went something like this