Buy a brandname M.2 SSD in low capacity variant and put it in an external case. A bit bigger then a thumbstick, but not as big as an 2,5hdd. If the casing fails (breaking of the usb port for example) you can switch the drive to another case or put it internal in a pc.
A bit more pricey solution, but usb thumbdrives get mostly the lowest quality flash chips.
so an icy box IB-1817M-C31 case is around 30€, add an 128 or 256 gb m2 nvme SSD for around 20€.