We had a question asking if there was a simple way to label flash drives, so they could be identified at a glance. Our reader said, “to me they all look alike, little black sticks.”
Flash Drives are pretty easy to label. I do have one caution, only write or place stickers on the part of the drive that stays outside the USB port on your computer.
You could buy some small labels or stickers and write on them or color code them. A white paint marker would be a good option for permanent labeling. Some suggest color-coding with a little swipe of nail polish if you have that available. You could even write on some label or masking tape and affix it to the drive.
You might also consider consolidating several small flash drives into a larger one for ease of finding the files.