I have the Lowepro Vertex 300 AW. It's a nice bag. Fits a lot of stuff in it. Very customisable inside. Comfortable to wear. Complies with airline carry on dimensions. Heavy on it's own though (3.8Kg empty) If you're using it to go on air planes, you only have 6kg worth of gear before you hit the 10kg limit. While I could fit all my lenses and a few extras in it, I had to move some stuff to my other bag and even my suitcase to keep below the limit. If you aren't going to be flying, it's a great bag for excursions.