Some negatives:
the seam of the inner bag tapers.
I have some doubts about the robustness of the zipper located on the edge of the pouch so under a lot of constraints, to monitor over time.
For now, after 3 weeks of use (rather "sometimes" that "always"), it is still like new: I have no regrets.
EDIT: the strap is released, it is not designed to support 4kg material (one pc of 3.5 kg).