No app, no printer setup, no PagePacker required for this one. Just a sheet of paper, scissors, and about a minute.
One sheet of paper (letter, A4, whatever you've got) and a pair of scissors. That's the entire materials list.
This is the entire trick behind every pocket notebook, zine, and PocketMod planner that's ever been folded from one sheet. Once your hands know it, you can make one in the time it takes to explain it to someone else.
The limitation is what goes on the sheet before you fold it: doing that layout by hand means measuring eight rotated, mirrored regions correctly, which gets old fast if you're making more than one. That's the part PagePacker automates: drop in the pages you want and it handles the layout math, so folding is the only manual step left.