The CURT roof rack cargo carrier extension offers a convenient cargo solution and allows you to add an additional 6 sq. ft. of cargo space to your CURT roof rack cargo carrier (#18123 sold separately), allowing you to securely store large items outside the vehicle. Free up space and ensure a comfortable and organized interior for passengers and pets! With the CURT roof rack cargo carrier extension, you gain an extra 6 sq. ft. of storage space atop your vehicle, and gain total of 17 sq. ft. when combined with the CURT roof rack cargo carrier (#18123). Its cage-style design features a 5\" deep basket, ideal for carrying bulky items, preventing shifting or falling while driving over inclines or rough roads. The robust steel structure is treated with a protective E-coat, preventing rust, and finished with a tough carbide black powder coat, ensuring resilience against outdoor elements, dings, and scratches while maintaining an appealing appearance.