I'm putting together a bug out, emergency bag just in case of a natural disaster especially after watching the fire that tore through Boulder County recently. I have a three day 40L molle assault bag with compartment for a hydration bag, I have a 3 liter one. This will be primarily for getting to a disaster center not for survival out in a forest or desert. I've already done a personal physical assessment and in a real SHTF scenario I'm most likely dead so it would be a stay in place bag.
Priority
1: Water
2: Warmth and light shelter (multi use poncho works best), emergency (mylar) blankets.
3: Food, high energy bars are light and take up little space.
4: Fire, I have a ferro rod and waterproof matches.
5: Self defense weapon(s)
6: Personal hygiene including at least 3 days worth of medications, a weeks worth would be better.
7: Clothing
8: First aid kit, I also have a compact trauma kit.
9: Multi functional tools (Leatherman, Swiss Army knife, etc).
10: Vital documents These can be on a flash drive and/or have hard copies.