I do take a tying kit with me when I travel, or on overnighters, but the kit always resides at the cabin / cottage (or the picnic table right outside the cottages). I find that I always have a need for some fly or another when out traveling away from home, but it also goes to follow that if you DO take your tying kit, then it's just the luck that the material you need to tie that fly is what you forgot to toss into the kit... and so it goes. Still, I find great fun in fishing the day away, then coming back to the cottage for the night and thinking about what worked and what didn't, only to tweak the patterns and make new flies based on my experience. That, to me, if half of the fun of it.
Tight wraps,
-ZugbugPete