I like the multi-purpose aspect of a metal container.
I am afraid container serching has become an addiction for me, I often care more about the container than the product inside.
In decades past many things came in great metal containers but these are now considered antiques and are high priced.
I recently found a nice hinge-top metal box at a gun show that was a military (Chinese?) rifle cleaning kit (cost $3 with the crude cleaning supplies), perfect size for a mini-kit (about 50% bigger than an Altoid Tin). Still working on this kit (really twin kits, for my son and I), I think it will be a PSK in a metal container plus other everday carry items all within a cordura belt pack. It will mostly be used for remote hunting, fishing and exploring.
Fancy chocolate shops are other good places to find tins but they are more expensive, and often have fancy pictures on them (my last ones has fairies painted on it).
I placed an DR/AMK PSK in my work coat pocket today after adding a folding Gerber knife, mini bic, matches, Micropur tabs, bandaids, alcohol wipes and a mini LED light. Thinking now I should of added a plastic bag also as there is nothing to hold water in to treat with the Micropur, DUH. First time I have carried a PSK not in a metal container.
Later,
Mike