Just an idea I'm pulling from P90 mag pouches - you could incorporate a snap on seal to the flap of the mag pouches. Store the mag with the BBs and feed lips up, and snap the seal over it when you close the pouch.
Also, I never use a dump pouch. I prefer rigid mag holders (like fastmags) and ram the spent mag back in after exchanging it with a fresh one. If you're using new P/E-Mags, you could tether the snap on cover to the mag holder with some webbing (to maintain orientation) and close them over the mag.
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