My daughter loves this bag. She is in middle school this year, and did not want to carry the typical backpack. I would like this size just a tad bit wider and longer, maybe an inch both ways, (we also tried the larger size bag and it is way too big). She is able to distribute the weight better with the shoulder strap across her body. She loves the color choices also.
I bought this bag for two of my children this year and they love it. The bag is big enough to hold all of their school books, lunch and other items too. It is sturdy, comfortable for them and even looks cool too. The only complaint is that the strap is a little too long and when adjusted there is no place to put the extra strap.
I have several different sizes of the messenger bags that I use for work. This size is very versatile in that I can use it on days I don't need a larger bag. It also works as a purse. My items are always secure and the quality of the material is high. My only complaint is that the strap can get a bit awkward.