I also have an OEM Subaru box, when I travel and park somewhere overnight = bought it from the dealer for $ 199.00... It's made for Subaru by Thule! The only difference (other than price) is that Subaru box is a "rear" entry box and the clips that attach to OEM cross bars are not "quick" connect like those on Thule....I would consider a basket for luggage, etc. but like the ability to lock a box as we're going to be on the road camping for about 2 months so there will be plenty of time that the car is left alone in a parking lot, etc. Also a box should help with aerodynamics.