If you are talking about the Deluxe Slipcases for the Mystic Hingeless, they are 12 3/8 inches high, and 2 7/8 inches wide. The depth is a bit tricky because they are contoured to match the curved spine of the albums - but the maximum depth measurement is 10 9/16 inches (measured from the side they're only 10 1/16 inches).
They are also notched on the sides with an obtuse triangle cutout for easy grasp of the album.
Hope that helped. I don't have the standard heirloom album, and don't know if they make slipcases for those. Perhaps someone else can chime-in on that.
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