Zippable

All you do is chuck all the stuff into a plastic bag and shake. I prefer the zippable, freezer bags because they're durable and can be reused.

Because we would be away from the car for an hour or more and because the carrier, though zippable, was not lockable and, in any event, was slashable, we put all the suitcases, etc., in the car with us while we drove downtown from the motel.