The best way to store them is to pump an inert gas (for example nitrogen gas) into individual storage containers and store them in a dark, cool place with UV protection.

But I’m almost certain no one is storing them like that.

I store mine in crystal clear dollar (Ike Dollar) tubes. You can store one pair per tube and then you can store all of them in the 50 count box that the tubes come in.

You could also display them in the tubes.

Since the tubes cost 70 – 90 cents each I recommend only storing the more expensive dice this way.