This heavy duty pack box is made to with stand years of back country packing. Light weight yet durable poly construction is impact resistant and won't shatter. Our pack boxes are as functional as they are durable. All panniers come with aluminum screw inserts on the bottom to install our part #PLEG, set of 8 legs to convert the boxes into a 33" high table at your camp site. The lids double as your table top when not in use and secure to the boxes with plastic tabs. The sides are curved to fit comfortably on your pack horse or mule. Each box comes with blended poly-nylon straps for extra strength in attaching the boxes to your pack frame and easy length adjustment.