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Frank WakefieldSleeves and top loaders are the way to go, those two above are telling you correctly.
I used to do that... now, some are in sheets in binders. Some are neatly stacked in boxes, loose. And some are in sleeves only, in a box. These last two ways make for better storage in a safety deposit box, they take up less space. I'm not recommending what I'm doing, just telling you what I do. I used screwdowns for a year or so, about 15 to 20 years ago. That is NOT the way to go.
Cards need to not be in bright light for extended periods. Don't frame so sunlight can hit them. Don't frame unless you use UV film and glass. The light will bleach your cards to nothing, given time.
So if you're not confronted with space crunch, do what Jason and Leon above do. I'd pitch your screwdowns.