You refer to the large "wallet" style storage. Actually, these are only appropriate for short term use....transporting discs, etc.
There are several issues with these; plastic sleeves which can "rot" polycarbonate discs, and disc warpage are the 2 most worrisome issues.
Never use these for DVD storage, never stack them and always store them upright on their edges (vertical), not flat or horizontal.
There are a number of threads here on this topic already, do a search.