Torpedoed principle

Behind the principle lies a great idea: put jerk rate, pass by demand backpack under the shoulder, open zip and remove desired objective. Also works just fine in practice, but the backpack contains a fundamental design flaw.
Assuming even that most photographers take the backpack to change multiple lenses quickly, it provides the first objective change with surprise that this high-quality backpack convenient zipper indeed allows easy opening of the upper part - only unfortunately precisely placed lenses cross and in the easily accessible top of the camera is located. Now, there may be people who want to access primarily to the camera, but I for example, hang me on the way the camera around your neck. Now, to change the lens, you have to deduct the backpack and ultimately open the zipper all the way to come from the front of the lens. Thus, the whole beautiful principle is torpedoed without mercy.
Nevertheless make overall quality and other advantages of the backpack joy. Who is a lot to the fullest traveling, is the ability to move the backpack forward, appreciate quickly.
Who but the backpack - like me - mainly buys in order to quickly change the lenses may be in for a rude surprise. Look at the part better previously commercially or ask to perform safety. It is worth it.