Amazon.com offers ROLA 59102 Wallaroo Cargo Bag for $27.83.
Rola Expandable Hitch Tray Cargo Bag Features rainproof material and sealed construction, this cargo bag easily expands to hold gear. It includes 6-straps for secure attachment, 2 interior pockets for easy organization, and expands from 9.5 to 11.5 cubic feet by unzipping. [ Shop Now ]