this is a small container that you can clip to your shirt and go.
all you need is a chisel tip Sharpie and a dremel

Step 1:

take cap off. Then use a dremel to cut the colored part of the plastic off, but leave about 3/16" so the cap can go back on. If edges a rough they may need sanding

Step 2:

throw the piece that you just cut off and the inner part away. Then just clean the middle and your done. Now you can put whatever will fit in there in there, put the cap on, and go.