THULE Motion Roof Rack Cargo Box Glossy Slidelock THU639950

( Brand: Thule ), ( Manufacturer Part Number: 639950 ), ( Color: Black ), ( Items Included: Clamps, Thule Motion 3 Xxl Roof Box ), ( Maximum Weight Capacity: 165lbs ), ( Compatible Roof Type: Flush-mounted Roof Rails ), ( Material: Abs Plastic ), ( Item Length: 91.5 ), ( Vintage Part: No ), ( California Prop 65 Warning: Warning, Which Is Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov. ), ( Type: Cargo Box ), ( Ipn: Thu639950 ), ( Item Height: 18 ), ( Attachment Type: Clamp ), ( Features: Heavy Duty, Removable ), ( Universal Fitment: Yes ), ( Item Weight: 58 Lbs ), ( Item Width: 37.5 ), ( Country Of Origin: United States )

Review THULE Motion Xl Roof Rack Cargo Box Glossy Black Slidelock

The **Thule Motion XXL Roof Rack Cargo Box (Part #639950)** is a premium, high-performance solution designed to transform your vehicle into a versatile mobile storage hub, ideal for adventurers, families, and professionals who demand both durability and convenience. Engineered with Thule s signature precision and innovation, this cargo box is built to securely transport a wide range of gear from bulky camping equipment and sports gear to groceries, luggage, or even oversized tools while maintaining aerodynamic efficiency and minimal wind resistance. Its **Glossy Slidelock** mounting system ensures a snug, vibration-dampening fit, eliminating the need for additional brackets and reducing the risk of shifting or rattling during transit. The **XXL size** (measuring approximately 48.4 inches long, 20.5 inches wide, and 10.6 inches deep) provides ample space for large items, making it one of the most capacious options in Thule s lineup, yet it remains compact enough to fit on most SUVs, trucks, and sedans with compatible roof racks. Constructed from **high-impact ABS plastic**, the cargo box is designed to withstand harsh weather conditions, UV resistance, and the rigors of off-road travel, ensuring longevity even under demanding circumstances. The **secure, snap-on lid** features a **double-latch locking mechanism**, providing peace of mind with a tight seal that keeps contents protected from wind, rain, and dust, while the **ergonomic handle** allows for easy one-handed lifting and maneuvering. Whether you're embarking on a weekend camping trip, hauling seasonal decorations, or prepping for a road trip with the family, the Thule Motion XXL delivers a seamless blend of functionality and reliability, making it an indispensable accessory for those who refuse to compromise on performance or convenience.

The Thule Motion XXL Roof Rack Cargo Box (part number 639950) is a popular choice for those needing secure, weather-resistant storage for large items on their vehicle. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

**1. Spacious Capacity**

The Motion XXL offers a generous 12.5 cubic feet of storage space, making it suitable for bulky items like camping gear, sports equipment, luggage, or even small ATVs. This capacity is significantly larger than many competing models, providing flexibility for various needs.

**2. Durable and Weatherproof Construction**

Thule uses high-quality materials, including a reinforced polycarbonate shell and a powder-coated aluminum frame. The cargo box is designed to withstand harsh weather conditions, including rain, snow, and UV exposure, thanks to its sealed seams and waterproof construction. This ensures your belongings stay dry and protected over time.

**3. Secure and Easy Installation**

The Slidelock system, which comes with the cargo box, allows for quick and secure attachment to Thule s roof rails. This system is designed to minimize vibration and reduce wind noise, contributing to a smoother driving experience. The box can be easily removed and reinstalled without tools, which is convenient for frequent travelers.

**4. Versatile Compatibility**

The Motion XXL is compatible with Thule s extensive range of roof rack systems, including the Motion and CrossTrax series. This means you can pair it with different rail configurations depending on your vehicle and storage needs. It also works with Thule s optional crossbars for added stability.

**5. Easy Access and Organization**

The cargo box features a wide, hinged lid with a built-in handle, making it simple to load and unload items. The lid can be propped open at various angles, and the box includes a removable foam liner that helps keep smaller items from shifting during transit. Some users also appreciate the optional foam inserts for additional organization.

**6. Good Weight Distribution**

At approximately 40 pounds (18 kg), the Motion XXL is relatively heavy, which helps distribute weight evenly across the roof rails. This can improve vehicle handling and stability, especially when carrying heavy loads. However, this weight should be considered when assessing the overall impact on fuel efficiency and towing capacity.

**7. Positive User Feedback**

Many owners praise the Motion XXL for its durability, ease of use, and the peace of mind that comes with knowing their gear is securely stored. Reviews often highlight its ability to handle long-term use without significant wear or leaks, particularly when properly maintained.

---

**1. Weight and Fuel Efficiency**

The Motion XXL is not lightweight, weighing around 40 pounds. This can negatively impact fuel efficiency, particularly on larger vehicles or trucks. If fuel economy is a priority, you may need to weigh the benefits of the extra space against the added weight. For some drivers, this trade-off is acceptable, but others may prefer lighter alternatives.

**2. Limited Compatibility with Non-Thule Systems**

While the Slidelock system is convenient for Thule users, it is not universally compatible with non-Thule roof racks. If you don t already have Thule rails, you ll need to invest in their system, which can add to the overall cost. Some third-party rail systems may not support the Motion XXL as securely or smoothly.

**3. Installation Complexity for Non-Thule Vehicles**

Installing the Slidelock system on vehicles without Thule rails requires additional hardware, such as Thule s universal rail kits or crossbars. This can complicate the setup process and may require professional assistance for certain vehicles. Improper installation can lead to security issues or damage to the vehicle s roof.

**4. Potential for Wind Noise**

While the Slidelock system is designed to minimize wind noise, some users report that the Motion XXL can still produce noticeable noise at high speeds, especially if the box is not perfectly aligned or if the lid is not securely closed. This is more common with larger cargo boxes and can be annoying during long drives.

**5. Cost**

The Motion XXL is a premium product, and its price reflects the quality and features. Depending on your budget, you may find that other brands offer similar capacity at a lower cost. However, it s important to note that budget options often sacrifice durability, weatherproofing, or ease of use.

**6. Maintenance Requirements**

To ensure the cargo box remains weatherproof and functional, it requires regular maintenance. This includes cleaning the seals, checking for cracks or wear on the polycarbonate shell, and ensuring the Slidelock system is free of debris. Neglecting maintenance can lead to leaks or reduced performance over time.

**7. Limited Visibility of Contents**

Unlike some cargo boxes with transparent or partially transparent lids, the Motion XXL has a solid lid. This means you cannot easily check the contents without opening the box, which can be inconvenient if you need to verify that everything is packed correctly.

---

The Thule Motion XXL Roof Rack Cargo Box is one of the most robust and versatile options available for roof-mounted storage. Its spacious capacity, weatherproof design, and secure installation make it an excellent choice for those who prioritize durability and protection for their gear. The Slidelock system adds convenience and stability, while the compatibility with Thule s ecosystem ensures a seamless fit for many vehicles.

However, the weight of the box and its potential impact on fuel efficiency, along with the higher cost and maintenance requirements, may not suit everyone. If you frequently carry large or heavy items and are willing to invest in a high-quality, long-lasting solution, the Motion XXL is an outstanding choice. For those on a tighter budget or with lighter storage needs, there may be alternatives that offer a better balance of cost and functionality.

---

- You need a large, weatherproof storage solution for bulky items like camping gear, sports equipment, or luggage.

- You already have or are willing to invest in Thule s roof rack system for secure and easy installation.

- You prioritize durability, ease of use, and long-term reliability over cost savings.

- Your vehicle can accommodate the added weight without significant fuel efficiency penalties.

- You are concerned about the weight impact on fuel efficiency or your vehicle s towing capacity.

- You prefer a more budget-friendly option and are willing to compromise on some features like weatherproofing or ease of installation.

- You do not own a Thule roof rack system and are unwilling to invest in one for this single product.

- You primarily carry smaller or lighter items and do not need the full 12.5 cubic feet of space.

For most serious outdoor enthusiasts, campers, or travelers who need a reliable and spacious roof cargo solution, the Thule Motion XXL is highly recommended. Its combination of quality, functionality, and security makes it a standout choice in its category.

Details:

Technical Specs: Best Use: Travel. Gear Capacity L: 600 liters. Sturdy lid design with a wide handle for smooth opening and closing. Compatible accessories include an interior box light, a protective liner and storage cover accessories not included.

Gear Capacity cu. Features: Wing-shaped profile with a dynamic, forward-leaning nose for reduced drag and fuel efficiency. Box Opening: Dual Side. In.: 36,614 cubic inches.

Internal Straps: Yes. Snowboard Load Capacity: 3-5. Full trunk access with minimal risk of contact the cargo box, thanks to its forward position on vehicle roof. Easy to mount, thanks the Power quick-mount system: The integrated torque indicators when its properly mounted, ensuring fast and secure fitting.

Ski Load Capacity: 5-7 pairs. SlideLock system, with separate locking and opening functions, automatically locks the lid in place indicates when box is closed securely.

part #: 639950 prices

• $1000.00-$1764.99

specifications azcarracks:

• brand: Thule
• mpn: 639950
• color: Black
• items included: Clamps, Thule Motion 3 Xxl Roof Box
• maximum weight capacity: 165lbs
• compatible roof type: Flush-mounted Roof Rails
• material: Abs Plastic
• item length: 91.5
• vintage part: No
• california prop 65 warning: Warning, Which Is Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov.
• type: Cargo Box
• ipn: Thu639950
• item height: 18
• attachment type: Clamp
• features: Heavy Duty, Removable
• universal fitment: Yes
• item weight: 58 Lbs
• item width: 37.5
• country of origin: United States

shipping azcarracks:

returns azcarracks:

• policy: No Returns

general azcarracks:

• Car Truck Parts Accessories > Racks Cargo Carriers > Roof Racks Cross Bars
• condition: Used

seller azcarracks:

• rating: 100.0%
• # reviews: 51
• city: Incline Village, Nevada

offer azcarracks:

• started: February 10, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1

payments azcarracks:

• other
• credit card: Diners-club
• wallet: Paypal

Thule 639950 Is Similar To:

• 05493 Thule One Replacement Cargo Box Mounting Hardware For Parts (40.6% similar) This came off Thule evolution cargo. Ideal replacement or extra hardware for your Thule cargo. What you see is get. This will only work on older Thule cargo's like the evolution and Atlantis. One piece is complete and the other missing u bolt red...(April 10th, 2018)
• Thule Cr-v Crv Odyssey 08l03-e09-100 Ski 08l03-e09-100 Rack Accessory Honda (33.1% similar) May for other vehicles. Comes with key, but no wrench. Was test fitted, but never actually used...(January 24th, 2015)
• 08l07-e09-200 Thule New Roof Rack (31.7% similar) Attached to the available roof rail and cross bars, bike attachment allows you transport your bicycle without having remove front wheel. This is an upright bike attachment that folds down, giving the rugged sporty appearance when not in use. Up for sale is a Thule roof mount bike attachment that has...(March 19th, 2017)
• 091021240278 Thule New Motion Xt Alpine Rooftop Cargo Carrier (48.1% similar) 25 in interior dimensions: 84. Long and low-profile this is a great cargo box to hold your skis, snowboards, poles boots. Snowboard capacity: 3-5 model: 6295B lifetime 'bring it. The Thule motion alpine XLT is a sleek, stylish cargo box designed for your winter sports activities. The integrated ...(March 22nd, 2018)
• 091021845008 Thule 1585 Roof Rack (33.7% similar) Brand new in box sold as pictured. Thule roof rack fit kit model 1585 Toyota corolla 4 Dr sedan...(August 6th, 2017)
• 091021983502 Thule Inch Aeroblade Black (33.6% similar) To get a correct and accurate shipping quote your destination, enter country zip postal code information into the calculator. Thule ARB60B 60 inch ablate black item specifics: model: color: condition: new distressed packaging features: aerodynamic shape to reduce cabin noise integrated t-slot for ...(July 26th, 2018)
• Prices Carrier Combi Thule Transporter 1.25 665c 2 Hitch Mounted Basket Rack (23.3% similar) 5 inches x inch out of the box rear of vehicle access in seconds with tilt down design pre wired tail lights included, 4 pin license plate accessory included plug valve makes clean up easy cargo box lock included, one key system COMPATIBLESTL2 hitch lock locks box to vehicle, sold separately ...(January 14th, 2015)
• Prices Rack 1023 Thule Traverse Fitkit Fit Kit Roof (18.5% similar) In very good condition. Used once to test fit on a vehicle about a month ago...(May 11th, 2014)
• Thule Crossbars Boat Kayak Rack 1050-05 Vintage (32.5% similar) I provide fast communication, and I am as honest and reasonable on as I am in real life. I go to tag sales, flea markets, and the like. When I see a good deal, I bring it here for a wider audience. Shipping is fast and free. Good machine hunt bargain. I am not a perfect person, but it is my goal to ...(June 11th, 2014)
• Rack 1050 Sweden Prices 4 Support Thule Roof Towers (21.8% similar) False 18 pt 18 pt 0 this offer is for 4 support towers for a Thule roof rack system. 2 words in Swedish are also on them but I cannot read them. They are all metal, painted black with a rubber protector at one end. They are high wide at top and at the bottom. 1050 and made in Sweden are stamped on ...(February 27th, 2015)
• 1061-052-1 Car Brackets Rack 1061 Set Thule Roof System (22.8% similar) Parts are new in original box with an instruction sheet. Four brackets and rubber pads as shown in the photos...(January 2nd, 2015)