Each Book of Incantations is made from PU leather with 30 stitched-in pages that hold 30 standard-size cards (2.5" x 3.5"), or 60 cards double-slotted. Every edition includes a set of 20 reusable, double-sided wet/dry-erase cards for on-the-fly notes.

The Deluxe Tome Edition has the same PU leather construction and 20 reusable wet/dry-erase cards as the standard editions, plus a set of 8 custom-designed Magic Item cards included in the package. Tome, Druid, and Dragon editions vary by cover design and foil detailing rather than card capacity.

It depends on the page type. Epic Monster Card Pages use a 6"x8" page with a 2-slot layout — a 5.25"x5" pocket for an Epic-size monster card plus a 2.5"x3.5" pocket for a standard card. Large Monster Card Pages use the same 6"x8" page size but with two 3.5"x5" pockets sized for Large D&D Monster Cards.

The Large Monster Card Pages are confirmed compatible with the Forged Curiosities Cache binder. I don't have confirmed compatibility info for the Epic or Standard page variants — worth checking before stating that in copy.