Our MaxxHaul roof rack is constructed from durable rugged steel with powder coat finish. Installs on most factories and aftermarket crossbars and includes rubber gasket to prevent internal rusting. U-bolts include rubber caps to protect the cargo that are being transported. Easy to assemble and quick to install. We highly recommend that you park your vehicle or store this rack indoors and coat the Truck Bed Liner Paint to make the entire rack rust proof from harsh outside elements. Roof rack comes with Water Resistant Bag, the 15 cu.ft. rooftop cargo bag measured 44inch (L) X 34inch (W) X 17inch (H) is giving a large storage space allowing to hold 4-6 suitcases, luggage case, tents and other staffs. *warning: Hard point staffs directly in bag may cause bag damage, always put light duty and soft cargos.