I found that a shotgun ammo belt holds 10 round tubes and CO2 quite well. And as an experiment I removed the threads between two of the loops and found that a TPX mag fits in perfectly, and interestingly enough a 3.5oz CO2 tank does as well. Once I get it setup I will post pics. I am trying to go for the lightest constant air setup that I can. I figure about 7 mags should be enough. And if I needed more I could probably add 2 x 50 round pods for refills.