Since I had only a small backpack for my equipment and the equipment grew steadily, it was time for a bigger one. Have spontaneously my backpack with their local dealer bought because he had a very good offer. The Lowepro Prorunner 300 is not too big and not too small and can be worn very well. The attachment of the tripod I think it's great because you can stow the strap for tripod. Furthermore the 300AW also has a chest and lap belt with the lap belt can be stowed. Currently have my EOS 550D, 18-55mm, 70-300mm, 50mm, Sigma flash, charger, remote trigger, manual, number of memory cards in my backpack and I have plenty of room in it for min. 2 lenses. the exterior compartment can still be various things that you do not store maybe for photography needs (drinks, etc.) So can a clear conscience the Lowepro 300AW very Prorunner Share and also give 5stars!