Colorful storage cubes are built rugged to withstand tosses, tumbles & heavy loads. They are premium storage for any situation. Lid & walls are transparent. Each carries up to 50 lb. They hold letter-size or legal-size hanging files & folders with a capacity of up to 3500 sheets of letter-size paper or 3000 legal-size paper. Modular design allows custom-stacked storage solutions. Cubes can be stacked in any direction. They also stack & interlock with Storex Premium Crates (sold separately). The storage cubes are PVC-free & BPA-free. Colors include blue, red & purple.