I use a mini Altoid for multi-Vitamins and other pills, and nothing else. I'm sure I could use one to build a self-contained firemaking kit: small ferro rod, scraper, cotton balls, Vaseline. You're good to go!
I use the "Altoid Smalls" tin for medications too. I used to carry a small pill capsule that I could attach to a keyring. I take migraine meds that have to be left in a heavy foil/plastic capsule that is about 1"x1" and the Altoids Smalls tin is as portable, durable solution as I've been able to come up with.