No more dangling lens cap!
592427
I have a Nikon P510 and the lens cap was tied to the strap.  The only problem was that it sometimes got in the way when I was moving about and using the camera.  I purchased this camera buckle lens cap holder and installed it on the camera strap and it works great.  I am able to use both the camera buckle and the original lens cap leash.  I'll never lose the cap, and it isn't getting in the way anymore.  Perfect!!!!
1271418
Simple idea that holds the lens cap great. I used this with my default lens for my Canon T3i.
4250261
Sturdy replacement lenscap does what its supposed to do. Fits perfectly!
767379
Excellent product.  With a long lens, it is tough to put the lens cap in place with the hood mounted, and this replaces the need altogether.  Easy to fit, does not slip off, and helps keep lenses clean in a dusty environment.  No cons I could think of.
1860478
I have this annoying tendency to lose lens caps and hoods. And monopods but that's a different story. I have bought a few of these in different sizes to have handy and really like them. Easy to just keep on the lens when packing it in your bag to leave your shooting location. A second is all it takes to extend or collapse and you can definitely put your lens cap on without having to remove the hood. (Assuming you haven't lost your lens cap as I often do!)

I tend to think the rubber might give a bit extra cushioning in the bag than the lens with a hard hood. And if I've taken one off for some reason and I've lost it, well, it's a much cheaper replacement. I've even given them too friends with great reception.

I'm frequently shooting on the beach more or less into the sun for backlit subjects and having these helps reduce flare unless that's the effect I want. In which case I just push it back to collapsed state!
107941
Purchased these caps to replace the caps that came with my Sigma lenses, which are very difficult to get on. These work excellent, as I was informed from some source I can't remember. Excellent product!
2158375
I lost my lens cap to my Nikon lens and I got on Amazon in a hurry to order new ones. I came across these ones and for their price, it's worth it. They do the exact same job as an expensive lens cap from Nikon, but for a way cheaper price. These things are amazing and they saved my lens from getting scratched. This product is amazing.
2162818
Springs are tight, so cap stays on.  Comes with a string to attach to camera body or strap, but removed it immediately.
206242
My new Panasonic camera came with lens cap without an attachment. This saved the day so I no longer worry about losing the cap.
4602218
I've had Sima lens cap keepers on my lenses for years - possibly 10 years or so. I put them on my film cameras and then on my SLR.  I've never had a problem with any of them. I actually tried to get it off of an old lens that I was trying to sell.  I could not pry it off.  That says a lot for how sturdy the sticky part is.  I often hike with the cap off of my lens dangling and swinging as I walk.  I've never had a string break despite this rough treatment.
3314350
These are a MUST HAVE for all camera owners. They come in a pack of 5 for $2.02 with FREE shipping - what a bargain. They ship directly from China, but I received them in 1 week. The adhesive on the cap holder is very strong and should last a long time. The elastic band fits perfectly around the lens and will hold the cap securely. The stripe around the elastic is a dark red color and looks great. I ordered 2 packs - 10 total and I installed them on every lens that I have. This is a very small item but will prevent the loss of a lens cap for your expensive lens.
4005087
These are the greatest things for your lens caps. Keeps you from misplacing them when using your lenses. I have one for all of my lenses. I have never had a problem with them coming loose from the caps. These were delivered fast and work great.
3171601
As a new DSLR owner I made this purchase because I know that as a forgetful person I would easily misplace my lens cap. This cap fits my camera strap and does not slide up and down which I was worried about. If you properly put the lens on the cap holder, then it will not pop off.
4463225
This was exactly what I was looking for. Lens caps are a nuisance - ya gotta have em, but what do you do with them while you're shooting? Lose them, if you're anything like me. My CoolPix P510 has a lens leash included/built in - why does my DSLR - at 4 times the price - not? No matter, these are the babies you're looking for - elastic loop around the barrel of your lens, little sticky tab on the cap and a string between. No more fiddling with or losing lens caps. This was also the best price I found on Amazon. Go for it.
2033050
Why didn't I think to look up a lens cap with a string that attaches to your camera before I bought and replaced 3 of them, which disappeared into some black hole? This is a durable cap with a beautiful Nikon-quality design! It's impossible to lose too! :P
4024826
Fits over the lense nicely and does what its supposed to do! Yet you're still able to slip it off fairly easily. Definitely a good purchase.
1337317
Great product.  I love that it fastens to the camera itself so no more lost lens covers!