You can check a uniform supply shop or militaria shop for something that looks like a 'fanny pack' but it fits directly on your belt. They are actually holster pouches for weapons/concealed carry. Generally sturdier than fanny packs and don't use that strap in the back which can tear, come loose, get cut.

As long as your belt stays on and your pants stay up.... It's not going ANYWHERE!!

Steve in Albuquerque