A pair of 7-in wide rolling carts that turn the dead gap beside a toilet, a washer, or a vanity into three tiers of storage. Because the tiers detach, the two units can stand apart in different rooms or combine into one taller shelf. Waterproof PP shelves handle splashes and drain through built-in holes, so shampoo bottles and cleaning sprays never sit in a puddle. Each tier carries 18 lb behind raised baffles that stop bottles sliding off in transit. The 27-in height clears most under sink plumbing, and tool-free assembly means the set snaps together without hardware.