I walk a lot. I have occasionally made the six mile trek to and from work on foot, just for the heck of it.
VIM pocket reference.
Travel track ball, in a snazzy hard case.
Batteries, with various charging cables.
Various extra meds.
Small first aid kit.
Hand warmer, one of the old original Jon-E kind, which belonged to my grampa.
Zippo lighter with small bottle of fluid, and extra flints.
Stocking cap, when I’m not wearing it on my head.
USB drive with encryption keys, GPG keys, encrypted password database, and various personal documents.
Several flash lights.
Dog treats, dog bags, and a leash, since I tend to come across a LOT of stray dogs in the summer time.
Other odds and ends that aren’t coming to mind right now.
I’m working on a way to affix one of my solar panels to the outside of the thing, so that it can be easily attached and detached.
My last backpack was one I had for more than a decade. It went to Ireland with me. The only reason I got rid of it was that my dog peed on it, and I wasn’t able to get the smell out. I spent about $150 on this one last summer. At the time, I didn’t like shelling out that much cash, but it was worth it. This thing is built like a tank, water proof, and quite comfortable.
I’ve been wanting to put these patches on it for a while. Laure did it for me this weekend. The two army patches are from the two units I served in. 163rd Armored Cavalry on top, 40th Mechanized Infantry on the bottom. A Raspberry Pi patch that came with one of my older Pi’s, a Debian Linux patch that actually took a bit of hunting to find, an old Star Wars patch, and just barely visible on the other side is an Instructables patch. I’m trying to find an Arduino patch, but not having any luck there so far.