try stacking just one vertically. For a larger space, add more boxes to each horizontal level. One thing to remember as you complete this DIY is that the bathroom is a damp place. A wood sealant ...

Elmer's Carpenter Wood Glue or Gorilla Wood Glue are adhesives ... Once the glue is dry, turn the taller stacks back to back and glue the two-crate stack open side up between them to connect ...