I found only one thread about this, but we're desperately in need of roof racks and a box for our Prius 4 Touring. Luckily this trip is just me and our 2 kids with 3 dogs, my husband will be away for work. I checked Thule and nothing. Nada! Someone please tell me there are racks and cargo boxes available for this model or will be before December.
I to will be looking for a roof rack, but haven't looked yet. But It sounds like your looking for ski box. Here's what I ended up doing on my CRV ski car. I was tired of the skis in the car so I researched a roof box. I had this this in mind when I bought the car. I got the roof rails and cross bars. So I just needed a box. After looking at all the real pricey boxes, I determined they don't fit well. With the standard mounting the rear of the box is hit with the tail gate open. Another option is a trailer hitch ski rack. I almost did this because I have a hitch. I was in Honda and saw they have those clam shell rack that go on the stock cross bars. They are great, made by Thule. I think $130. Half the width of the car and they hold 4 sets of skis. They go on in 5 minutes, and are on all winter. The boards and boots go in the trunk.
Toyota Prius Interior & Exterior Accessories Here's the crossbar part. As for the actual box, Thule's website said it's under development (as of March 2016). Yakima looks to suggest only soft-boxes (nylon) and not the hardcase plastic ones. Hopefully either manufacture will come up with something concrete soon.
Try Rhinorack. They have a roof rack that is advertised to fit. I have not personally tried it. Lou Posted via the PriusChat mobile app.
Have you thought about adding a hitch and a rear cargo carrier? The box-on-top will really kill your mileage!
This looks like it ataches to any crossbars and will do little damage to the aerodynamics. Thule Pulse Alpine - Aspen Ski And Board
My guess is those bars are pricey, as is any proprietary add on item. There marked up a lot. I got them added on to close the deal on my CRV
From rackoutfitters website (sorry i cannot post url), search Thule KIT1824 Scheduled Release Sept. 19th 2016