This thread reminded me of this video
https://www.youtube.com/watch?v=4MrSbAjFWEoIt's a helicopter pilot recounting his experience with a "survival kit" plus lots of other gear and a spare 15 gallons of fuel.
Also couple of videos of him undergoing training by doing an overnight with his survival kit. Quickly learn what sucks and is missing.
https://www.youtube.com/c/bradleyfriesen/search?query=survival%20training