I'm gonna pile on with everybody and say constant air is the way to go. I need to get a straight remote line myself.
Tuff products makes a excellent mag carrier, although its a bit pricey at ~45 bucks it holds 8 magazines. I'd highly recommend giving it a good look Tuff Products :: Magazine Pouches :: P.M.S In Line™ Magazine Pouch Series
And also agree on the Dump, get one bigger than you think you need and find a sturdy way to mount it. I tried a leg one and hated it.