One thing I have noticed with some Mizuno trolley / cart bags is that the head cover is attached the 'wrong' way round. IMO only, of course.
What I mean is. Imagine the bag sat on your trolley, and it's raining. Ideally you'd want the zip running underneath the clubs so that the rain hood still covers the clubs even when the zip is open. If that makes any sense. Some Mizzy bags have the zip on top. Damn useless when it's raining as there's no protection for the clubs as soon as you open the zip!
Just an observation, and one that eventually brought the demise of mine.