making it easy for the tag to slide off
349659
i got these to use to connect my dog's ID tag onto her collars- she has a lot of collars and its a pain having to remove the ring every time.  These are not very giving: they stretch out and a gap is left between the two pieces of the ring, making it easy for the tag to slide off.
1428789
We got the orange ones. They're large and flexible and although you can slightly see the pen marks through the privacy flap, it's not enough to make out what it says. For me, turning the metal cord into a circle shape while trying to screw the thing together took a few tries but it did get more flexible after I did it a few times. The screw thing isn't the easiest the move but maybe that's not a bad thing since I don't want the tag to be easily removed. The metal cord also goes through a hole in the privacy flap, so in order for someone to read the tag, they can only open the flap a little and have to look at an angle. So far, they seem sturdy and the privacy flap stays shut.
2676892
These are the best tag protectors available, after BPT's. The heart allows the 't' of the attacher to fit nicely without indenting the tag itself. They are easy to put on.

I don't think anyone has the mold for making tag protectors any more, so they are getting harder to find, especially new ones.
678045
Easy to peel off and easy to line up and stick. Just be careful not to get it stuck to itself, because that's not easy to undo.
2213930
I like the ease in placing cover and it does come off if pulled on from a pocket, but I like it better than the hard snap on covers.
4229860
This product was easy to use in creating name tags for our guests, but the adhesive wasn't particularly strong.  They had a tendency to peel off of the clothing (although they didn't leave any sticky residue on the clothing-a good alternative!).
687961
Passing this along to the world for ease of installation. Use hot glue to attach the clips. Then clip the rope light in place. The glue holds tight, but can be removed easily later.
2785081
The clasp is very easy to use.  I didn't find it difficult to remove links, though it was a little tricky at first.
4923378
After reading all the complaints about the packaging I decided to be very careful in removing the tag.  I put the blade end into a small bowl with boiling water and carefully begin peeling it back, returning it to very hot water until finally able to remove it.  There was adhesive remaining on the end of the blade so I got out the Goo begone and let that soak in a bit and then was able to wipe it off with a paper towel.  It was a bit of a pain but not impossible.  It does require a bit of patience.
1429354
It is a good name tag, but easy to break and less durability
1529673
After years of replacing my dogs personalized name tags, this is a great idea! One of my schnauzer's would scratch the metal name tag until it was unreadable. My other dog would somehow, always manage to lose the name tag. With this collar, I won't have to worry about my dogs when they do get out of the house unattended. I like the fact that there are so many different color combinations to choose from.
3375044
These are inexpensive little clips so that tags can be switched easily from one collar to another.  So far they seem to be sturdy, though I don't know that they'd take strong tugging on them.
2056387
Ordered this because it seemed like the easiest way to relieve my dog's apparent allergy to her metal tags. It does the job, and has held up decently in the few months she has worn it. I wish it was slightly larger, as I have no control over the size/design of my county's dog license, and this year's tag is quite large and stretches the Quiet Spot bag.
613880
The FasTags pet tags are really easy to use. They even have a nifty little paper that you write your pet's information on, then you just put the tag over it and copy it exactly.  They shrink up into an adorable little tag, and the writing is perfectly readable. Just make sure to follow directions (use a permanent marker to do the writing), and it will come out very nice.
2227963
I was hesitant with this attaching with velcro but love it. I just ordered 2 more. Finally no more chewed off dangly tags
2957206
As others have noted, the labels do need a bit of scraping to get off.  However, they don't fall off either.  I like being able to quickly tell what's inside the container.
59751
Easy to put on.  First attach the neck loops to your dog's collar then place the collar around your dog's neck. The plastic slits then slip into place through the larger of one of the sets (3 total) of holes. Then you tuck the rounded edge of the clip under the plastic and it is assembled. To disassemble it is a bit tricky. In my opinion, it is worth it though for the simplicity of the design. My dog is very calm even as being fitted for his cone - this may be much more difficult with a more jumpy pup.