Keeping track of the latest 'thumb-nail' sized usb memory sticks is one of life's little chores.
I have several and the purchase of these straps has made keeping them mostly together somewhat easier.
The only problem with fitting these items is getting its loop through the loop on the memory stick, one solution is a needle threader.
The other is a length of cotton to make a loop inside the phone strap's loop and use the cotton to pull the strap through the stick's loop.
I struggled a little but it all came together quite easily.
The supplied split ring does not suit some of the usb-sticks as the wire is too coarse for the tight clearances, but it does allow fitting to a larger split ring to keep several small sticks in one place.
I would not rely on the supplied strap to extract the usb stick from a device.
Be aware that these straps are supplied in 10's so it would be cost effective, they cost pence, to share them with friends if you do not use your purchase when delivered.