I purchased this backpack as a replacement for an identical one because the zipper broke on the initial one after almost a year of use.  I like this backpack because it has much more space than most, has useful compartments and has reinforcing side straps, which give needed extra support when the backpack is full and heavy.  My only complaint is that the zippers are still fairly weak, will need careful use, and will no doubt eventually break again despite careful use.