Sima Capkeeper 2 for SLRs and Digital SLRs

It is keeping my lens cap from getting lost, but I found it at Calumet for 1/3 the price after I had purchased it on Amazon.

The cap keeper sticks on the lens cap and the retaining strap goes around the lens barrel. With the elastic going around the barrel, I don't have to attach and detach the cap keeper every time I change lenses. I've used these for years. Every lens that I own has one. It beats fumbling with the cap trying to make sure that it goes into a pocket. If you're looking at a quick photo opportunity, you just pop off the lens cap and shoot. The cap dangles out of the way until you're ready to put it back on.

This is an ingenious addition to your camera.
You don't have to constantly keep track of your cap - it's hanging right there :)
The keeper is sold in the Ritz stores for $2, but it was easier for me to buy and get delivered online than drive around looking for one.
The product is decent

Have used these since my film days and love them. sure beats losing the lens cap. Sometimes the glue lets go and needs to be redone, but hey, there cheap. Buying a new set now to have sa spares. Some of mine are over 10 years old and still going strong.

"Sima Capkeeper 2 for SLR..." sounded like I was getting two (2) lens caps, but it is only one. Pretty expensive for one; plenty of cheaper alternatives.