Should the zipper be zipped or not when the washing machine washes the travel bag?

Because zippers are generally made of metal, it is easy to hook other clothes when they are open and not zipped, which affects the washing effect and is not good for other clothes, and it is easy to hook. It is almost the same reason that clothes with buttons are turned over for washing. Buttons are easy to hook when they hook other clothes, and then fall into the washing bucket.