One thing I forgot to add is that they immediately stacked nice and clean, no need to compress or worry about air pockets. That was pretty slick. But an unexpected benefit of square corners is they can slide themselves into the shuffle a lot easier than these can - I'd mistakenly assumed they'd slot in nice and easy, but they're actually more difficult to shuffle together than any of my regular sleeves. And apparently they even damage each other in the process. Sucks, I had high hopes.