This backpack is even more convenient than I expected. It is lightweight, comfortable, robust. I bought it several months ago and shows no signs of wear. It is adjustable via the interior walls with Velcro. A strap (stowable) from the bottom of the bag is clipped on the shoulder limiting the movements of the bag. Once attached strap, can run without the bag moves. For my part, I have a canon EOS 500D with 18-135 lens I leave mounted. The device can be stored and easily. I also agree: a guide, a small tripod, charger and cables, a second battery, caches, wipes ... And despite all this, I still have all the free upper pocket. In short, this bag is really handy!