I would choos some sets that are sealed in a bag like D’Addario, or Savarez. I just opened an old set of Ramirez strings in the old card board box. The strings were in a waxed paper bag., each individually. The wound strings were corroded, especially the low E string. Whereas I’ve never had that problem with old strings that were sealed. I use mainly Ramirez strings now, but I only have a couple of packs on hand. They aren’t sealed, just like their previous strings So I don’t want to store them too long. What strings are you using?