I would like to add that the BFG dump pouch is the lightest you can get, but it is not a dump pouch for guys who train to use dump pouches. Its a very thin fabric and does not hold open easily.
Personally, I train to dump empties on speed reloads and type 2 malfinctions (since the mag might be the cause) and reshufle mags so I can retain partials in the "bad" locations on my gear. I guess that requires me to explain my magazine administration protocol which is lengthy... sorry. Skip to the last 2 paragraphs if you dont care.
I run 1 or 2 mags on weak side belt line and three on my plate carrier up front and a mag in the gun. My mag pouches are open top friction based retention pouches that allow easy draw and reinsertion.This gives me 5-6 rifle magazines total to deal with and is more than enough for my LE job or self defense. Any extra is IMO dead weight and gets put into my soft case, a pack, etc. but not on my belt or carrier. The Houston SWAT team only has 1 in gun, 1 on belt, 1 on plate carrier for their fast response plate carriers with the other mag spots holding a radio and IFAK. But they have multiple guys backing them up, carry more when in full kit, etc. Some think 5 mags is too little or too much, but its my "do all" load out.
Magazine administration:
I draw primarily from the belt as my #1 speed reload spot. #2 spot is weak side chest on plate carrier unless I have a second belt line mag then it is #2 and weak side chest is #3, etc. Those need to be kept with full magazines. My "bad" spot or hardest/slowest to access spot is strong side chest on plate carrier, because you have to reach way over and your forearm tends to smack your chin on draw if you dont turn your head with a high mounted plate carrier (vs longer soft armor + plate heavy vest) and prone its a very slow/hard to access spot.
I administratively pull a full mag out of strong side chest pouch and put it in the belt pouch (or the closest to #1 "good" pouch spot) when time is available after a speed reload. If my belt line is full and my weak side chest pouch is empty I put a fully loaded mag there next, etc. I call this "administrative mag shuffling" for lack of a better term.
If I am doing a tac reload, it means I am NOT actively engaged in a fight, and I have time to top off with cover (either physical or from teammates). During the tac reload, I draw a full mag from my "worst" spot (starting with strong side chest, then center chest, etc.) then pull my partial and insert the full mag with same hand. I take the partial and move it to the worst open spot on my chest, starting strong side chest and working my way across.
By doing it that way, I keep my full mags in the best/fastest locations for speed reloads and have immediate access to my partials, should I need them, due to running low on ammo, but they are segregated so I dont accidentally put a partial in my rifle when I wanted a full mag and one was still left on my plate carrier.
This means I have better access to my partials than if they were in a dump pouch, mixed with empties, but I have to police mags during training. Since, for me, a dump pouch is more of a low use item, or a place to put a bad guy's weapon instead of the front of my pants, or a place to put a piece of evidence while in full kit, the BFG dump pouch is fine for me.
If you intend to train exclusively with a dump pouch as a time savings measure, because you don't want to leave empties on the battlefield or are concerned about a SHTF scenario where mags left might never be recovered and you end up with few mags but lots of ammo, the BFG dump pouch is not for you.
The BFG dump pouch is only anchored on half the mouth opening. The mouth has no structure to hold it open. The only retaining mechanism is a draw cord. If you leave it loose to make insertion easy, mags pop out when you run. If you cinch it more closed, the super thin fabric, no mouth structure, and 50% attachment to the molle makes it SUPER hard to put a rifle mag in there quickly without looking. Since it is attached 50% it tends to flop out away from the belt so it really needs to be on your side. It would be USELESS on your back or way behind your hip where traditional highly structured dump pouches work best and its dufficult to usecwithout looking. Also the material is highly susceptible to high heat items like silencers and gun barrels. Please make sure this is the right item for you. If you wont put much in it, or do heavy training depending relying on it, then its near weightless and takes up very little space.