I personally always have one USB stick with me that has a live usb boot of Fedoraon it, but I just saw the new video from Linus tech tips and thought about extending it a bit.
He mostly talked about windows tools, but I think I will add
Not OP, but I carry one from Star Tech. They are pricey, but if you need them, the are great.ine also has mass media support, so I can use a iso on my pc and boot the other computer to it, great for setting up servers when ilo/idrac decides to give you issues.
I just use a cheap $15 one I got from Staples. a bit of delay but it gets the job done when you just need in quick. They make way better ones for relatively cheap