I have one in cement, the design of the pack itself is awesome, it really is suprising how much space is in it, the thick padding on the shoulder straps is extremely comfortable and the webbing on them is also convenient for stowing gear and clipping items to. The only things that prevent it from getting five splatter skulls is the lack of a pocket on the strap for mobile phones and no dedicated storage for sunglasses but otherwise a fantastic every-day bag for work or for a medium-distance hike
I got the black one. I really like it because its rather compact. It has plenty of storage options and places to hang stuff from the outside, all at a very affordable price. A great bag for school or play.