Yakima CBX 18 Roof Top Cargo Hard Carrier Box, Fits Streamline Crossbar, Black

Product overview

Yakima CBX 18: What to Know

The CBX 18 holds 18 cubic feet of cargo and is rated for 165 lbs of load capacity, the same numbers as both Thule XL boxes in this guide, but the box itself weighs 65 lbs, the heaviest of the five boxes here by a meaningful margin. It opens from either side and is made in the USA, with integrated tie-down points and SKS lock cores securing both the lid and the box-to-rack connection.

Yakima states the CBX 18 fits its own JetStream, RoundBar, and CoreBar crossbars, plus 'most factory crossbars,' across a stated 24-40 in crossbar spread. Explicitly listing RoundBar compatibility is a genuine point of difference from the Thule Force 3/Motion 3 pair, which centers on Thule's own square and aero-shaped bar systems. That said, 'most factory crossbars' isn't 'all factory crossbars,' so confirm your exact bar spread falls in the 24-40 in range and that the bar's cross-section matches Yakima's clamp design before ordering.

The lid features an intuitive metal handle that locks gear inside the box and locks the box to the vehicle in one motion. One buyer-review claim found (not an independent lab test) described no noticeable increase in wind noise up to 85 mph; this is presented as an anecdotal data point rather than a verified acoustic spec, since no independent decibel testing for this model was found.

The clearest trade-off with the CBX 18 is weight: at 65 lbs empty, it's roughly 12-14 lbs heavier than the Yakima SkyBox NX 18 and Thule boxes in this guide for the same rated capacity, which meaningfully eats into a vehicle's dynamic roof-load budget before any gear goes in, worth weighing against its typically lower price.

Key Listed Features