That's flash storage, not traditional spinning-iron hard disks. Yes I am pedantic, but arguably they have different uses. Even then, the biggest USB flash keys I can see are around 4-8 Tb, and they are fraky expensive. Also, the damn liars do not mean "terabyte" when they talk Tb = in reality they are counting Tb as 1 x 1012 bytes, not 240 bytes as a nerd would assume. The difference means 1 Tb on the box will give you around 900 gigabytes of actual space as reported by the OS.
I'd buy a pair of WD or Seagateexternal 8Tb hdds and RAID them together or just have two drives with different stuff on em. Amazon looks like it'll sell a single drive for $100 give or take, so you'd be able to do it without breaking the bank.
If you want a cheap solution, buy a few dozen thumbdrives on sale, a half dozen USB hubs, and stuff it all in a shoebox, then set up RAID on your computer to merge/stripe all the thumbdrives together into one logical disk. Inelegant, but proven to work. Some maniac even did this with USB floppy disks for some reason.
Or buy several cheap and reliable hard drives of smaller capacity and do a similar thing. Consider if you have to have all the storage on one device.
There is a top limit to information density that can be achieved with our current storage technologies. If you think about it, it's mind boggling we are even able to cram a whole terabyte of information on a thumbnail-sized chip. Transistors can only get so small before the noise figure means information storage goes out the window. Same for magetic recordings: the magnetic domains can only get so small before random thermal noise will erase the information.