I've used my discarded plastic glucose tablet vials to store things in, but not in a PSK or FAK The problem is the cap slides inside the vial on those too. Another idea I had was Allen shotgun choke tube storage vials, but they are too large, and again the same cap problem. I use the Allen 6-vial choke tube storage pouches.to store up to 2 weeks worth of meds in each for camping, BOB, etc.