The Swiss Army knife is the go-to multi-tool for all types of people, but it hasn't seen much in the way of technological upgrades over the years. Instructables user dr_weidinger wanted to add a modern twist to his, so his grabbed an angle grinder and hacked a USB flash drive onto the knife's can opener.
You'll need a full-sized Swiss Army Knife, a Verbatim Tuff n' Tiny USB flash drive, an angle grinder, epoxy, sand paper and tape to do this yourself. Grind the can opener on the knife so it fits the USB drive, sand both sides of the USB down, and use the epoxy to hold it into place. It's a pretty simple process once you get the can opener sized right.
Swiss Army knives with USB drives are available for purchase, but at $100 or more and coming in a smaller package, dr_weidinger's solution is considerably cheaper if you already have a knife.
Swiss Army Knife + USB Flash Drive [Instructables]