Well, as with my PNW youth experience, I would hope that you would normally EDC some sort of rain gear or such. Since part of my EDC back then included footwear, a coat, and a hat or umbrella that kept me more or less dry while walking to/from school, work, or a friend's house. In that respect, a 72 hour kit would at best minimally augment what I would already be carrying, so hopefully I wouldn't feel the need to pack another rainsuit with me all the time. I guess it depends on you MO at the time. Mine always had me outdoors and in it, so trying to keep from getting waterlogged was a common effort.