Two things are going to damage your precious album sleeve - sunlight and damp. As long as you're protecting them from both of those it does not matter which way round you put them into a plastic bag. (assuming everyone is already orienting the inner sleeve to prevent the ingress of dust that is). I dislike plastic sleeves, they generate static and do not last very long before they become brittle and split - you'd a thought by now some bright spark would have come up with a better method of storing vinyl, especially gatefold covers that barely squeeze into a single-pocket plastic sleeve without damaging either the sleeve or the cover.
I also dislike having to buy anti-static inner selves - 60 years of album production and Record companies still sell the damn things with hard-card inner sleeves.
And while I'm on a rant - Gong 2032 ... what a piece of utter crap that "gatefold" sleeve is, it may look very pretty, but it's badly made.
grr!
As much as I like vinyl surely it is not beyond the wit of man to devise a better means of packaging them. I'd even tolerate a 12" digipak or a suitable acrylic jewel case if they could do it properly, for the money we're paying for these it's about time the quality improved, especially if we're to treat them as "collector's items".... actually, to hell with that, I buy them to play them not to keep for my daughter to sell when I'm dead, but I'd really like the sleeve to be considerably harder wearing and less damaging to the vinyl surface than they currently are.
pah!