What makes a backpack in my view, is the fact that you carry it on your back. This backpack carrier you but only from the apartment to the car and the best ever on the back. Otherwise do a carrier on the shoulders hurt. The carriers are inferior and just plain bad (in nylon sewn foam). They are equipped with an anti-slip rubber-like attachment which, even forms wrinkles at the moment, where to put the carrier on the shoulders, because they were obviously sewn in straight state. Something not even find the least expensive in the cheap. They are just Sche .....
I'm going now to buy a second tracking backpack, cut off the carrier at the Tamrac and can sew new.