I have a Sienna with a roof rack and a need for extra luggage space. Last year I borrowed a hard side carrier and am looking at getting my own for our family vaca this year. I'm not sure I want to pay the 300-600 bucks for the hard side version and I'm also not sure where in the world I would store it the rest of the year. Has anyone had experience with the soft side ones? Obviously my concern would be keeping things dry and wear and tear on it. Any thoughts one way or the other would be appreciated.