I carried strike anywhere matches up and down the Appalachian Tail in the 70's in a cheap plastic combination whistle/compass/matchcase without incident. I recently found that old matchcase in going through some of my old gear and the matches inside (from the 80's) still worked fine. It's been stored in cardboard boxes in sheds, attics, and garages and never opened until September of this year. When the matchcase was in my pack in the 70's it got dropped off of one cliff, floated in several rivers, and generally well used without regard for the matches inside. I loaded matches one up and one down (just to fit in a couple of extra) and used them almost daily without incident for years.