Unikeep clamshell binders. I put raw cards in either mylar card sleeves or card saver 1s, then into pages, and into these 1.5" clamshell binders by Unikeep. The binders are 100% polypropylene and stand up on their own in a straight line with very little shelf space wasted. My T-sized cards go into mylars made for 1951 Bowman cards from tcverify then into nine-pocket pages. Larger cards go into 4 or 2 pocket pages. Photos and premiums into single-pocket pages.