That's a good setup for an emergency stash.

If you want repeated access and can give up a little space savings, a prescription pill case works well enough:
http://www.pharmacyerrorinjurylawyer.com/pill%20bottle.jpg
It's big enough to hold a mini Bic, cotton balls with Vaseline, and a tiny ferro rod and scraper.

By the way, a mini Bic is waterproof. You just need to let it dry a bit after it gets dunked in water. So, you don't need to be too worried about protecting it from water.