From the style here, which is evident from the description herein at Amazon.com, I promised myself some of these Grürteltasche: fastening with belt loop and snap hook, 2 slots for 2 smartphones, a zippered compartment for items such as spare battery and / or earphone.
But the first practical test, in which I had my pants belt pulled through the belt loop, I found the same deficiencies of this belt bag firmly:
Even opening the front cover with the Velcro is me alone failed when using only one hand (my left hand). So that works out, I had to hinzunhemen my right hand. The reason probably lies in the fact that the material from which this belt bag is made very soft, thin and biegsamm. In addition, the opening of the belt loop is very large and thus slip the belt pouch for easy on your belt.
And when I had fixed this belt pouch on my belt buckle, I am not able to open the zipper of the great times.
What I have sought for me, is a carry case for my phone, when I can pull it out with only one hand my phone from her and put in back into it. And that I did not succeed in this belt bag also in several attempts. Therefore, I can not recommend buying this belt bag in my opinion.