【Generous 17 Cubic Feet Space】Measuring 69"L x 33"W x 11"H and holding up to 165 lbs of evenly distributed gear, this rooftop box frees your back seat for passengers and keeps luggage dry.【Durable ABS Hard Shell】An impact resistant hard shell with a glossy finish shields your gear from rain, snow, road debris, rust and UV rays, so gear arrives clean and protected.【Dual Side Opening】Open from either side to load and unload without walking around your vehicle; self supporting gas struts hold the lid open so both hands stay free while packing.【Security Keys and Locking System】2 security keys and 2 reinforced straps keep your gear locked and tied down; keys release only after every latch is fully closed for peace of mind.【Tool Free Installation】Mounts in minutes with no drilling on most factory, round, square and aero crossbars; the low profile aerodynamic shape cuts wind noise on cars, SUVs and wagons.