The standard for neg storage for many years was Printfile, sold by many supply houses, including Freestyle, an APUG sponsor - you can see them here-
They also have a thinner weight to the bottom layer (against which the emulsion lies) to facilitate convenient contact printing without removing them from the preservers.
I still use them, and find no static issues. I am not aware of the 10 year replacement issue waltereegho mentions.