Whatever method you use to protect your matches, it should be able to withstand being in water for up to ten minutes without the matches becoming wet.
Do not be lulled into a false sense of security by carrying so called "waterproof matches"
Although the head has a waterproof coating, after ten minutes in water moisture has soaked up the stem of the match and inside the head. You can see in the picture below that the head has started to disintegrate as I tried to light the match.
and here is a close-up of the head
There are ways you can protect matches yourself and we will cover some of those in part three.