Posted By:
warshawlawI store all non-slabbed cards in a penny sleeve inside a top loader. This system successfully rode out the 1994 Northridge earthquake w/o so much as a dinged corner, and my home was trashed so badly that the city condemned the building.
For display, I put the top loaders into postcard (4 slot) pages and into D-ring binders. The top loader/sheet combo virtually assures that the cards won't get creased even if the sheet is a little tweaked. Only drawback is thickness of the package. I use a 2" binder and can only get about 200 cards into it comfortably.