The Thule 603 Ascent 1500 has been replaced by the Thule 624 Force M
Thule 624 Force M

Thule 624 Force M

The Thule 624 Force M cargo box offers value and space while still offering key conveniences. The 624 Force M has a cargo capacity of 13 cubic feet and is only available in matte black.

Thule 603 Ascent 1500

Thule 603 Ascent 1500
  • Thule 603 Ascent 1500 Alternate Image Thumbnail
Product Code: 100603
Status: Discontinued
"The folks at Rack Attack are true experts in this category."
- Fred Clark, CEO Thule
Related Products:


The Thule 603 Ascent 1500 cargo box is 15 cubic feet, and the ulitmate in a luggage style box. The Thule 603 Ascent cargo box has a smooth, aerodynamic design, minimizing wind resistance. This cargo box is easy to mount, open and lock.


  • 15 cubic feet of storage
  • Box Outer Dimensions 65 in. X 35 in. X 16.4 in.
  • High grade impact & scratch resistant material sets the Ascent series apart from all the rest
  • New Quick Grip hardware for easy on/off attachment to roof racks
  • Access gear from either side of the car using patented dual-side opening feature
  • Smooth, aerodynamic design for minimal wind resistance
  • Easy opening and closing with the one key, NO-GO Central Locking
  • Mounts to most factory installed racks, and aftermarket racks
  • Diffuser Technology - improves aerodynamic and torsional stability

Buying Notes

The Thule Ascent will ship directly from Thule, please allow 7 - 14 business days for delivery.


Weight: 35lbs

Length (carton): 66.9"

Width (carton): 35.1"

Height (carton): 16"

UPC: 091021603509

Manufacturer: Thule

Manufacturer Part Number: 603

Thule Warranty

Thule warranty information.

Thule Warranty

Ask A Tech if This Rack Fits Your Car

This product does not have any reviews yet.

 Add a Review

Your Review


Vehicle Select


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: 1-888-440-5556

If you drive an SUV or van, probably not. Be sure to measure the total height of the vehicle with the Thule 603 Ascent 1500 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.

While the weight limit of your roof rack may differ, cargo boxes can hold up to 165 pounds.

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.

Symantec site seal