PDF's of books like
Boat Building for Dummies
Survival on Desert Islands
The SAS Survival Manual
US Army Rangers Survival Manual
9005 Fire Starting Techniques
The entire electronic back archive of American Survival Guide magazine
And, of course, every episode of Gilligan's Island.
The rest of the space would probably go to music. Mostly metal, some hip hop, some synthwave, a little classical, and like 2 country songs for those really rare occasions when I actually want to hear country music.