WhispTech talks about the Slimline CO2 Pouch he designed in cooperation with OneTigris... "This was an idea that I brought up awhile back but think forgotten in all the hustle of the site. I have searched high and low for even a shotgun shell holder of this design but usually because for shells hold 12, or even 1tg 7 and all different designs but not really meant for co2 however can be used.