For several years I've been using the orange plastic screw top match boxes from Coghlan's for similar jobs. <text snipped> And at a dollar or so (last time I bought a bunch) you get a couple for the cost of one Keep2go...  
I also use these match containers. I have tried several methods of putting a lanyard loop on them  Easiest is to drill a hole in the cap, tie a loop in some appropriate line.  Stick it through the hole with the knot inside the cap.  Put a bit of some sort of sealer on the hole.  Works great. Very rugged.  I carry pills, hearing aids, sewing kits, small parts and lots of other stuff.