That is interesting. Surprising Samsonite would miss that. I guess the gorilla didn't try the expansion feature during testing? For most competitors, the expansion zipper goes all the way around so it expands all the way around. Those expansion zippers are between the regular opening zipper and the hard shell. It sounds like from the reviews that on the hinge side, the hinge is attached in two places and the expansion zipper only applies to one of the attachments?