I go through my day pack, which has all my essentials for deer hunting in it. I make sure i have a handful of candy bars, a bottle of water, all the basics. Make sure my favorite hats and gloves are there. I shoot throughout the year so I am confident that I can grab either of my standards and be all set.
Last year my goal was to hunt only black powder (patch and ball, open sights). I got a four point with my percussion rifle, and oopsed when I took out my .308 on a real sloppy day at the end of the season...and finished out my tags. This year, my goal is to hunt strictly with my flintlocks. No excuse not to. The only exception will be for if I need to hunt a back ridge, where the deer are consistently well out of range necessitating the modern crap.