On our travels my big backpack Lowe was often somewhat impractical. One had to take it off, put on the ground and then be able to change a lens. Depending on the terrain that was not satisfactory to me. So I decided to put me on a sling backpack for short trips. The choice fell on the Think Tank. Ordered via Amazon delivery woman was not long in coming. This part is very well made, the zipper is great and the comfort is still ok. However, it must be said that a load on two shoulders already distributed but is easier to wear over time. But that one knows in advance. The practical at this backpack is that I can change the shoulder. It's quick and easy and was also the main reason for me to decide for this part. Why now a point deduction? Well, if you have several lenses with him and wants to change one, you feel attracted to the front pocket on the chest. It unzips, takes a lens out, replaced and tucked the impersonated lens again. Then you realize that the bag could be even stiffer. You warps up in the open state and one must then often reach under the bag to the weight balance so that you can pull the zipper again. But that's to complain at a high level. I am satisfied with this backpack.