I just use my s9's internal memory as an encrypted drive and carry a cable, any old, cheap prepaid Android with a passcode will work as an encrypted drive it needs to be unlocked to allow access to the internal memory, also it's very hard to recover data from the nand chip itself, with a USB you can bypass all that protective junk and put jumpers directly to the storage and yeet the data off of it by bypassing everything. You can't lose, break or forget your phone as easily as a flash drive.