Thule Motion 3: The Ultimate Buyer's Guide

Introduction

If you're in the market for a roof cargo box, the Thule Motion 3 is a top contender—but is it the right choice for your vehicle and lifestyle? From buying used to understanding its performance in snow and rain, this guide covers everything you need to know before making your purchase. We’ll break down the differences between the L and XL models, test its waterproof claims, and reveal which cars fit it best. Whether you’re a road-tripper, outdoor enthusiast, or just need extra storage, this deep dive will help you decide if the Thule Motion 3 is worth the investment.

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1. Buying a Used Thule Motion 3: What to Check

A used Thule Motion 3 can save you money, but you’ll want to inspect it carefully before handing over cash. Start by examining the shell for cracks or deep scratches, especially around the mounting points where stress accumulates. The locking mechanism should operate smoothly—stiff or jammed locks could mean internal damage. Open and close the lid multiple times to ensure the hinges aren’t worn out. For a full checklist, read our used Thule Motion 3 buying guide.

Ask the seller about the box’s history—has it been stored indoors or left in the sun? UV exposure can weaken plastic over time. Check the rubber seals for dryness or cracking, as these are critical for keeping water out. If possible, test-fit it on your car to confirm compatibility. A well-maintained used Motion 3 can last years, but a neglected one might cost more in repairs than buying new.

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2. Thule Motion 3 in Snow & Rain: How It Holds Up

One of the biggest selling points of the Thule Motion 3 is its weather resistance. The dual rubber seals along the edges create a tight barrier against rain, while the S-shaped opening design helps prevent snow buildup. In heavy downpours, some users report minor moisture at the corners, but interiors generally stay dry. For real-world testing, see our snow and rain performance review.

Winter travelers will appreciate the reinforced lid, which can handle snow loads without flexing. However, in extreme conditions, brushing off accumulated snow before opening prevents meltwater from seeping in. The textured ABS shell resists ice damage, and the locking system remains functional even in freezing temperatures. If you frequently drive in harsh weather, this box is a reliable choice.

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3. Thule Motion 3 L vs. XL: Which Size Fits You?

Choosing between the Motion 3 L (17 cu. ft.) and XL (22 cu. ft.) depends on your storage needs and vehicle size. The L model is ideal for compact SUVs like the Subaru Forester, offering enough space for 4-5 suitcases without overwhelming the roof. The XL, meanwhile, suits larger vehicles such as the Toyota Highlander, fitting bulky gear like skis, camping equipment, or extra luggage. Compare them in our L vs. XL breakdown.

Consider your typical cargo—weekend trips may only need the L, while cross-country moves justify the XL. Also, check your car’s roof load capacity; the XL adds weight, which could strain smaller vehicles. Aerodynamics matter too—the XL creates slightly more wind noise and drag, potentially reducing fuel efficiency by 1-2 MPG compared to the L.

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4. Waterproof Test: Does the Thule Motion 3 Leak?

Thule claims the Motion 3 is waterproof, but we put it to the test. In simulated rainstorms, the box stayed 99% dry, with only trace moisture near the latches after hours of exposure. The double-sealed edges and drainage channels effectively divert water away from the interior. For detailed test results, check our waterproof evaluation.

That said, no box is 100% leak-proof in extreme conditions. Driving through torrential rain or high-pressure car washes might allow minor seepage. To maximize protection, store soft items in dry bags if you’re traveling through unpredictable weather. Regular maintenance—like cleaning the seals and checking for debris—ensures long-term water resistance.

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5. Best Cars for the Thule Motion 3

Not all vehicles pair well with the Motion 3’s dimensions. It fits perfectly on mid-size SUVs like the Honda CR-V and Ford Escape, where the roof rails align with the box’s mounting points. Sedans with factory rails, such as the Subaru Legacy, also work but may need extra caution with sunroof clearance. For a full list, see our compatible cars guide.

Smaller cars like the Mazda CX-30 can handle the Motion 3 L, but the XL might look oversized and affect handling. Always measure your roof width and load capacity before buying. Vehicles with panoramic sunroofs require precise placement to avoid obstruction. When in doubt, consult Thule’s fit guide or visit a retailer for a test fit.

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Conclusion

The Thule Motion 3 is a versatile, durable cargo box that excels in weather resistance, security, and ease of use. Whether you opt for used or new, the L or XL, or plan to drive through snow or rain, it’s a reliable choice for expanding your storage. Just ensure it fits your car and lifestyle—because the best gear is the kind you’ll actually use. Ready to hit the road with extra space? The Thule Motion 3 has you covered.