Anyone use the OSS dump pouch? I'm looking for a low profile dump pouch for my MRB.

I've always been impressed with the overall quality of BFG gear, and I've bought a fair amount of it.  No regrets whatsoever.

The _Minus gear is intended to be extremely lightweight.  I have not heard about problems with it stretching, but I don't hear everything.  Mine hasn't stretched, but I am not one to run triple-deep mag pouches, either.  Other mfrs have brought to market products along this same line, most of them being what a fair-minded person would call top-tier.

I believe something along this general line is the wave of the future, as everyone has an interest in lightening the soldier's load.  I own and use a couple of platforms of the skeleton type.  They are used with pouches of the older, Cordura nylon construction, and so in my personal experience, there is no undesirable loss of stiffness where it matters, the cordura nylon pouches being inherently more stiff than the more modern, extremely lightweight pouches offered in the same material as the skeleton platform.  I have yet to test this skeleton platform with the very lightweight pouches which are offered as being particularly suitable.

One of the things I've learned over the years is to never buy a product in the first year of its' production.  The mfr has a learning curve just in simply making the stuff, and that is separate from how the product performs in the real world, as opposed to mfr testing.  For cars, the third year of production seems to be a better buy, as user input has had a chance to be manifested in improved construction techniques, and mfr fixes of reported problems. 

We're dealing with a much simpler product in this case, and I reckon if any corrective measures are called-for, they will be implemented very quickly.  For example, if very lightweight pouches don't offer stability/rigidity in conjunction with the skeleton-type belt or chest rig, it is a simple thing for the mfr to include a small stiffening sheet of plastic within the back of the pouch to enhance the pouch's rigidity.  I don't say for a fact that this is necessary in all cases, but it is an easy fix for extremely lightweight gear pouches in conjunction with equally light platforms.   NOT to imply anything negative about BFG gear, or any other mfr; just writing generally. 

This sort of construction is definitely the future of tactical gear, so I advise getting familiar with it.  I'm always reminded of the backpacker rule that if one takes care of the ounces, then the pounds take care of themselves.  To paraphrase Karl Marx:  "Soldiers of the World:  You have only your ounces to lose!".