I've been buying 6 mag pouches direct from the manufacturer at a killer price. These pouches hold 6 30 round mags and have a shoulder strap. They are part of the MOLLE system.
Go the the site and you can order online.
I am not affiliated with this company. Just passing on what I consider to be a good, mil-spec, useful product at a great price. I had bought a couple of these for 39.95 before I found 'em here.
I have a pic but have'nt taken the time to learn how to post them. Anyone care to fill me in.