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The units themselves are not Stackable.
However...
Our units help organize and access the full height and full depth of your spaces.  
To go taller, place your shelf above the lower unit(s), then mount another unit on that shelf.
2 Shelves of Spice Racks2 Shelves Organized

The Best Cabinet Organizer. Period.

Organize NOW! Prepare for the Holidays.
SAVE 10% on subtotal: Buy 3 or More Units.
Use Code: Org10