This flash drive has a rare design: the attachment loop is on the cap, not on the body of the drive. It's a stout cap.
At first this seems dumb, but here's how to make great use of the design, if you always keep the drive with you (in your backpack, suitcase etc.):
Attach the cap with a cord, keyring, etc to the inside of your backpack. Doesn't need to be detachable.
When you use the drive, just pull it out of the cap and plug it into the computer. The cap stays behind, and doesn't get lost. When done, plug the drive back into the cap in your pack.
You never lose the cap, you never have to fish for the drive in the bottom of your pack, and you don't need to set up some sort of detachable cord on your pack.