I really like this thread.

All my "GO" lists have specific categories of items:

#1. pack & packing materials
#2. food / water / preparation / purification / fire
#3. shelter / sleeping / clothing / hygiene
#4. navigation / light / communication / fire
#5. utility / tools / fire / special
#6. utility / self-defense
#7. first-aid / medical / fire / water purification

Our lists are quite similar. I wonder if I should post in detail.