500 crystal clear resealable bags for your single CD's or any single CD sized game you would like to protect.  These will protect the cases from getting scratches that will diminish the value.     

These are the exact same bags as the NES cartridge bag so it has multiple uses.   

Acid and lignin free 

100% safe for your collection

There is a resealable flap on the back that can be opened and resealed over and over with no problem.