This is my first Ameribag, I ordered the medium in Spruce/black and I love it. The main reason I bought it was that is has a pocket for a waterbottle.
I'm a pocket "whore" so this bag has tons of pockets, even one I found after I've had it for a couple days. I bought this for every day use and I think it'll work, my only concern is that I could probably use a Large.  This is a fabulous bag, very well made with heavy duty zippers. I'm overly surprised at how great the quality is.