I have now sleeved my entire collection of 1104 cards with premium sleeves. They feel awesome!
I was cavalier in choosing a size of sleeve, so the cards are now too big to fit in the Enhanced Edition Box, which is unfortunate, but I'm not letting that get me down. With such a thick plastic, I doubt the cards would have fit in the box anyway.
I currently have them (just barely) in a two-piece 1600-count cardboard card box. It's a bit unwieldy without a handle, so I intend to move them into a briefcase as soon as I've figured out how to pack them securely, which I'll probably do with two one-piece 800-count cardboard boxes. The 800-count boxes store the cards on their side so they will be short enough to fit in the briefcase. The added advantage of the briefcase, besides fitting the cards more easily and having a handle, is that I'll also have pockets to store things like art prints and over-sized villain cards.
This is a briefcase that I got as a gradution gift from college twenty years ago. Besides unnecessarily accompanying me on a few interviews, I've never had a real use for it before.
