Can Carry Up To 100 lbs. Made From High Density Polyethylene You can take everything you need on trips with the X-Cargo XL Rooftop Cargo Box. Safely transport your luggage and extras on the roof for comfortable traveling on long trips or away for a weekend adventure. This extra-large roof box is made with an easy-to-use lock, so you can ride with confidence knowing you'll have what you need down the road. The hard shell design on this cargo carrier is made with High Density Polyethylene and can store 15 cu. ft. of supplies.