I've purchased a few albums online recently and one retailer or ebayer I can't remember asked if I wanted the album shipped inside the cardboard cover or outside. Then some of them automatically shipped the albums outside of the cardboard cover but inside the plastic album cover sleeve.
This made me wonder if I should be storing all my albums outside of the cardboard cover but inside the plastic album cover sleeve. I assume the album and the cardboard cover itself might incur less wear and tear by not trying to squeeze the album into the cardboard cover every time. If the albums are stored too tight or close together tho then the vinyl is probably better off inside the cover.
I have new plastic album cover sleeves and plastic inner sleeves for the vinyl itself but I haven't installed them all yet.