We have around 75 of these and they have done well. Except for one batch of 29 that we bought and 3 have so far developed the same issue. The zip on the top. The tooth spiral comes away from the fabric. These are our newest bags and the older ones have not had the same problem even though they are around 2 years older.
It's a good sized bag to dayly commute or half day hikes. I personally don't like the air editions, so was looking for a 30L, simple backpack. A few more pockes would be very useful or a divided inner part also. In total is a great money -product value.
Bought for senior school for my daughter after using a different colour one as her travelling bag. So comfy I've now bought one for myself as a change bag for carrying all the items needed for going out with the family with a little one.