The only ever ausmachbare weakness of the product in the long term, I see a zipper. Experience has shown that holding profile zippers longer than coil zippers (the Wikipedia article on "zip" further helps if you do not know the distinction). In spiral zippers "can" the threads dissolve slowly in the long term and with frequent use. What can interfere with the engagement of the members. Here I have also both bad experiences (very old Eastpack backpack) as well as good experience (in Case) made with regard to the longevity of such zippers.
Right away, however, the zipper is neither cheap, nor bad processes or the like. Should he ever fail, a thicker rubber band would be able to hold together the two half sure the bag.
