All you need are 3-5 milk crates, zip ties, wood, wood finish, and some tools to make it happen. As far as furniture-building goes, this is one of the easiest projects you could ask for.

Juggernaut Storage 3-Pack Heavy Duty Plastic Milk Crates with Handles, Black, 24 Quart - Stackable Utility Open Crate Bins for Home, Garage, Dorm, Office, and Vehicle Organization ...

The plywood seating seals in hideaway storage and is custom made to each crate. Architects Mateo Pinto and Carolina Cisneros of Venezuela and Argentina respectively founded the Combo Collab in 2010.