I have this one. It’s tiny, so it’s tough to angle into a USB port sometimes, but being so small and having a relatively sturdy loop on the back end of it, it should remain ready for use until I take it off of the key ring and lose it! There is a bit of a speed trade-off with respect to some of the other ones, but…

Vote: Transcend 64GB JetFlash 710 USB 3.0 Flash Drive