I love this bag so much! Had it for a couple weeks now and couldn't be happier. I am a busy student and it is the perfect size for all that I need. It can fit my 15" MacBook when I need it, but usually I just have some notebooks, lunch, water bottle, coffee mug, etc. in the bag. It's incredibly comfortable and super easy to take on/off, in addition to being very easy to adjust. The second strap seems like an odd fit at first but I am now fond of how it sits when I am riding my bike. An added bonus is that one of the middle pockets fits a 10.5 iPad Pro perfectly - even with the Apple Keyboard it just slides right in. The large shoulder strap is awesome, and even when my bag is full/heavy it's comfortable to wear. Much more comfortable than other messenger bags that have smaller straps and the way that sit on your shoulder tends to pull you on one side or the other, whereas the fit of this bag is great. And I obviously LOVE the buckle. As an engineering student I can appreciate the the thought and engineering put into this bag!