Alexander Miha wrote:

Does anyone know if Toyota Matrix is long enough to carry a 17' sea
kayak?

With ease. My Honda Civic hatchback is somewhat smaller than a Matrix and
carries two sea kayaks comfortably.

If you're dealing with a factory installed roof rack, you should look at its
load rating, though, if you plan to carry two heavy sea kayaks - two plastic
kayaks, for example, could weight about 120-130 lb and can exceed some lightly
made roof racks.

Mike