My personal experience and findings on CDR storage safety.
You need to look out for:
- heat changes (not just max/min temps)
- humidity changes (not just max/min relative humidity)
- mechanical stress (abrasion, bending, warping, very small dirt, etc)
- electromagnetic radiation (particularly near UV and UV)
- writing procedures (i.e. only write on the transparent center of the disc)
- chemical contact (solvents in particular, but also high ozone content or heavily ionized air)
- handling (proper procedures, equipment, read speeds, etc)
In practise most cd wallets (by Caselogic or any other name) have a few problems: they don't protect from mechanical stress and actually the most vulnerable part of the disc (the label side) is usually pitted against the label side of another disc. Most wallets do not cover the label side 100%. Also, they offer less protection from abrasion with small dust.
Be aware also that some cheaper wallets I've seen do not use acid free plastic in the sleeves. This could turn out to be a problem in the long run.
CD jewel cases are quite space taking to store, if you have many discs. Some professionals use specialized cd storage systems, but these are quite expensive.
As for most durable scratch resistant discs, my votes go to:
Emtec Ceram Guard (made by Tayio Yuden and getting hard to get as Emtec reorganises)
Verbatim Crystal Super Azo (made by Mitsubishi Chemicals)
PS Some material to look up, if you're interested.