Rola 59102 Expandable Hitch Tray Cargo Bag - 9.5-11.5 Cubic Feet

Featuring 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.
View product details at Amazon