I was amazed at how many things you can accommodate in this outwardly very compact backpack. My D7000 fits with screwed Zoom convenient to the main compartment, to the not exactly small flash SB-900, a 200 and a 300 Zoom will also find space as a set of extension tubes and the lens aperture of the lenses. These then stow even 2 large interior compartments with zip and outside you can still see so things like notepads, manuals etc. comfortable.
The zippers work fine, the Amazon advertising Zipper does not bother me, other companies advertise indeed on their backpacks.
Wear the backpack can be very comfortable. Now, if the shelf life is still somewhat, I am extremely satisfied. More power for so little money one can hardly expect well.
PS:
Regarding durability: the backpack is now 2 1/2 years in use and I'm still excited about it. He accompanied me both on holiday and my shootings and has never let myself down