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Yakima SkyBox NX 18: What to Know
The SkyBox NX 18 holds 18 cubic feet of cargo in a box that weighs 53 lbs empty, notably lighter than the CBX 18's 65 lbs for the same rated capacity, with dual-sided opening and SKS lock cores integrated into a full metal opening handle that locks gear inside and locks the box to the vehicle.
Yakima states this box fits round, square, wing, and most factory crossbars, in addition to Yakima's own StreamLine system, across the same 24-40 in spread range as the CBX 18. That gives it the broadest stated crossbar-shape compatibility of the five boxes in this guide alongside the CBX 18, and a genuine advantage over the Thule pair for buyers whose crossbars aren't Thule's own.
Yakima's specific design claim here is 'market-leading internal usable space with an unobstructed flattened floor' and an NX nano-texture finish on the lid and base. That distinction matters because two boxes both labeled '18 cubic feet' from different brands can pack noticeably differently depending on internal wheel-well intrusions or floor contour, external cubic-foot figures don't always translate to identical internal packing space, and this is a real, under-discussed source of confusion when shoppers compare 18 cu ft boxes across brands purely on the headline number.
One pricing note: Yakima's own site listed this box in Canadian-dollar sale pricing ($849 CAD vs. a $1,099.99 CAD regular price) at the time of this research, so use the actual US Amazon listing for accurate USD pricing rather than assuming price parity with the CBX 18 or the Thule boxes in this guide.
Key Listed Features
18 cu ft capacity, box weighs 53 lbs empty
Dual-sided opening with a full metal handle and integrated SKS locks
Fits round, square, wing, and most factory crossbars plus Yakima StreamLine, 24-40 in spread
NX nano-texture finish with a flattened interior floor for usable packing space
