What Roof Bag and Cargo Box will Fit My 2018 Lexus NX 300 with Flush Rails?  

Question:

Expert Reply:

You are totally correct with saying that you will need to add a crossbar system in order to use the Thule Interstate # TH869 to your flush factory rails on your 2018 Lexus NX 300. As far as the quality of the interstate, it is made of TPE, which will help the bag retain its shape even for 2-day highway driving. The Interstate will also keep your cargo dry even through short intervals of heavy rain. With all of these qualities, the Interstate is a great choice in terms of cargo bags.

If you are looking for a bit more rain protection, I recommend a cargo box like the Thule Force XT L # TH6357B. The Force XT L comes will provide keep your cargo drier than the Interstate and will allow you to fully open your rear hatch when mounted on crossbars. One of the extra benefits is the same-key locking system that provides theft-deterrence for your stored items.

As far as a compatible crossbar system for both the Interstate and the Force XT L, I recommend the following setup on your 2018 Lexus NX 300 with flush rails:

- Rhino-Rack Vortex Aero Crossbars - Aluminum - Black - 49" Long # RRVA126B-2 (black) or # RRVA126S-2 (silver)
- Rhino-Rack SX Series Legs for Vortex Aero Crossbars - Flush Factory Side Rails - Qty 4 # RR37QX

With this particular system, you will be able to hold up to 165 pounds on your roof. However, I recommend confirming with your vehicle's owner's manual to make sure your roof can withstand that much weight.

expert reply by: Bob C

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