Having a notebook with frequencies is a clever touch—doesn’t take up space and could be a lifesaver if tech fails. I’ve thought a lot about water filters, too, not surprising since one can only last a few days without clean water. Personally, the first thing I’d toss in my bag is a solid fixed-blade knife. Might sound basic, but it’s the workhorse for everything: cutting cordage, food prep, splitting wood, even first aid in a pinch. Growing up, I always felt a bit lost without a trusty pocketknife, and that’s stuck with me.
Of course, if you’re out there for any real length of time, you’ll need more than a knife, but as an all-around tool, it’s hard to beat. I do keep a small water filter as backup, though—no arguing how vital that is. For anyone who’s tried different filters, do you notice much difference in taste with some of the compact models? I’ve had a few that left water tasting pretty odd.