Works great to store CD's in with less bulk than the original case. Also good for CD copies. The envelopes are just paper and do tear and eventually wear out and need to be replaced.
These envelopes are great but I am disappointed at the new way they seal. They used to be pre-glued like a regular mailing envelope but now there is a pre-cut tab that you insert the flap into to seal envelope shut. The tab just gets in the way and doesn't keep envelope shut very well.
I work in a income tax preparation office which burns tax returns to CD's and gives them to our clients instead of printing paper copies. We were using jewel cases but these envelopes work much better both for mailing purposes and for handling purposes slimmer and not as bulky as the jewel cases.