Is a motorcycle considered a vehicle "in" for the purposes of the Fourth Amendment?

For purposes of the Fourth Amendment, "containers attached to the car . . . are 'in' the car." (See Wyoming v. Houghton (1999) 526 U.S. 295, ___[119 S.Ct. 1297, 1301] [addressing the need for probable cause to search for incriminating evidence in a car].) We see no reason to treat motorcycles differently from cars in this respect. A motorcycle, like a car, is a vehicle. Thus, containers attached to a vehicle, whether a motorcycle or a car, are considered "in" the vehicle for purposes of the Fourth Amendment.