I agree with kj_norway.
The thumb drives have limited storage space. The largest I have is 32 gigs, Yes, they come larger but for the same price or a bit more. One can get the small 1T Byte from Seagate that is 1/2"x3 1/2"x5. and it runs off the USB power.
I have one that I carry with with each laptop. It contains backed up files and a current "True Image" of the C drive, so I can rebuilt the laptop on the go if needed.
There are many brands out there and they are all worth the money spent.