An 18 cu. ft. rooftop box is large enough for a family's luggage or ski gear, and the Force XT XL is built to mount without extra adapters on Thule's own aerodynamic bar lineup. The PowerClick mounting system clicks audibly once each clamp reaches the correct torque, so there is no guessing whether the box is seated correctly before a trip.

Thule 635801 Force XT XL Rooftop Cargo Box Features:

• 18 cu. ft. capacity with a 165 lb. weight limit; always check your vehicle's maximum roof load rating too.
• Fits Thule AeroBlade, ProBar Evo, SquareBar Evo, and WingBar Evo cross bars without an adapter.
• Fits Thule Xsporter Pro, TracRac-Truck, and TracRac-Van systems with an adapter (sold separately).
• PowerClick quick-mount system clicks when each clamp reaches the correct mounting torque.
• DualSide opening provides access to the interior from either side of the vehicle.
• LockKnob closure helps protect the included key from damage while opening and closing the box.

Confirm your cross bar model against the fitment list above before ordering to determine whether an adapter is required.