Processing Hama bag is not really great, but for the price it does make a very good impression. The metallic blue exterior walls with knubbeln not look very nice, more however. It should be noted that the bag is not like a tight hard-shell case, but a little flexible. The stability should, however, will usually suffice. The Navigon bag has approximately the same strength, it is my Navi far nothing happened.
On the rear side, where the two halves are stitched together, the Hama-bag is somehow crooked. Of these works from the quality but OK. The zipper is (as opposed to the Navigon part) easily and even equal to 2 slider.
In addition, the bag has a chance to attach to a belt and a detachable wrist strap.
Inside there are 2 elastic straps which hold the Navi safe and the "cover" still a small side pocket, can be stored in the memory cards, cleaning cloths or other small parts.
My conclusion: A decent inexpensive Navi-storage option, which is a definite improvement on the Navigon bag.
