A small red USB that I'm unsure of where it came from. It only has about 8gb of storage, but all of my writings from the past 10+ years are on this thing. I've tried getting new USBs with more space, but I can't seem to find one that works as efficiently as this tiny thing. And because I carry it with me basically all of the time, it's accidentally been thrown in the washing machine and dryer at least a dozen times, and has suffered no damage at all.