I store my junk silver in tubes and my ASE's and similar bullion coins in single air tight plastic holders.
I store what I consider to be "bullion" coins in tubes. (ASE's, circulated 90% silver coins, etc) For the ASE's, I prefer the CoinSafe tubes. I store "Proof" coins in their original packaging, or in AirTites. I have a lot of foreign silver coins in 2x2's, mostly so I can write what I've identified about them on the cardboard.