i found this interesting you tube video.

8:57 min video here

New Hampshire Fish and Game Conservation Officer Brad Morse describes what - as a member of the search-and-rescue team - he carries in his rucksack.

your needs / carry will vary geographically. but i think it provides a good basis for what type of things you may want to carry when you're off the asphalt and concrete.
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“Everyone should have a horse. It is a great way to store meat without refrigeration. Just don’t ever get on one.”
- ponder's dad