Ace Business Backpack B4 documents and laptop compatible I used this for commuting for about a year. I handled it with care, but two parts of the zipper broke, and it's difficult to open unless you do it just right. Perhaps it can be repaired by someone who can sew by hand?! I don't have the skills, so I gave up and bought a new one. Other than the two broken zippers, it's still in good condition overall since I only used it for a year, and it's still usable, which is a shame. I heard it's possible to repair it if I send it in, but it might cost around 10,000 yen. If repaired, it would be much cheaper than buying a new one.