Since I seriously started collecting coins and bank notes a few months ago, I have been trying to select storage supplies that provide maximum protection from environment and more importantly don't damage collection themselves by emitting acids and PVC. There are many supplies on the market but it is hard to determine which of them are trully safe for the collection. It seems that the best way to make sure that supplies are safe is to use what expert numismats and museums use. Does anyone know which brand of supplies ( coin flips, currency holders, storage boxes ) are used by Smithsonian for its National Numismatic Collection and by other leading museums? Your help is greatly appreciated.