The Thule Sonic Box combines efficiency with style. It's designed for those looking for an aerodynamic box with a wide variety of sizes and convenience options. The Thule 635B Sonic XL Black has a 17 cu.ft. cargo capacity.
17 cubic feet cargo carrying capacity
High-gloss automotive finish
Patented AeroNose design cuts through the air and reduces drag and noise
Patented rear-angled base and expanded vehicle mounting points help maximize trunk and hatch clearance
AcuTight mounting "clicks" when you reach optimal hold to ensure your box is secured to the rack
Oversized SecureLock ensures the box is closed securely and properly prior to driving
Dual-side opening for loading/unloading from either side of the vehicle
Fits Thule rack systems, round bars and most factory racks
Dimensions: 89" x 34" x 16"
The Thule Sonic will ship directly from Thule, please allow 7 - 14 <b>business days</b> for delivery.
Manufacturer Part Number:
Ask A Tech if This Rack Fits Your Car
Frequently Asked Questions
Below you will find a list of the most frequently asked questions for this product. If you need more assistance you can email a rack-install technician, or call us at:
While the weight limit of your roof rack may differ, cargo boxes can hold up to 165 pounds.
While you will want to take some measurements of your bag, any of the Thule XL (or XXL) boxes would be would be a great pick. XL size Thule boxes have 17 cubic feet of space and about 17 inches of height depending on the box. Just make sure to measure the distance from your rear roof bar to your open hatch (if you have one) to make sure it will clear. If you have any questions on that call or email us at Rack Attack.
As long as your vehicle is equipt with the crossbars (side to side) then all of our cargo boxes will attach directly to the rack. If you have a rear hatch, make sure to measure how much room you have and compare to the box length to make sure the hatch won't hit the box when opening. If you don't have crossbars, you will first need to add those prior to adding in a cargo box.
If you drive an SUV or van, probably not. Be sure to measure the total height of the vehicle with the Thule 635B Sonic XL Black installed, and keep that information handy (on the inside of your sun visor is a great place). Running into your garage will, unfortunately, void the box's warranty.