We use the mid-sized low profile rubber-mate action packer and carry it in our front rack. It is low enough that it does not affect cooling the engine or transmission. We store our gray water bottle, electrical cords, gray water hose, oil and small gas can for generator. In short it holds anything that is used in the rain and can be packed up wet. Thanks for caution on the bug problem. We taped a 4 inch plastic skirt to the front half of the lid using duct tape and believe it - it keeps the lid from letting in rain during driving. Cheers