[IMPORTANT ADDITION: Extremely strange, and yet, after 3 years they changed the size and materials of the case... I had bought this same case for myself and for people close to me, and it was always the same, until the last purchase in Summer 2026, and the phone no longer fit while the material has changed and is tight, it doesn't open like the old one... What can I say, I was disappointed and now I have to find something else. The review below no longer applies]

First of all, I don't use it as a running case, but as a simple phone case.
To start with the size: I notice that the colored cases of the same type and brand all say they are for phones up to 6". Only the black one says it is for phones up to 6.7" and I think it may be a wrong listing because they fit only just barely. Personally, I put a 6.71" phone inside, on which I also have a protective case (a silicone case for the back only). At first it stuck out a little, but when I pulled the zipper, the extra fabric around the zipper covered the phone and the case closed, barely, but without giving you the feeling that it might tear because its material is elastic. Due to the elasticity, after a few days it takes the shape of the phone and closes even more easily.
It gets 5 stars because of the value for money. It is a very affordable product, worth the money; of course it is a medium to good quality case, not intended to last for years. Its material is soft, and the elastic with Velcro on the back is good quality. One of the zippers sticks a little, but anyway when you pay €3, it doesn't bother you. Overall it has two pockets, one for the phone (maybe also something else, e.g. a pack of tissues) and a smaller one for money, keys, cards, etc.
It belongs to the category "Universal Mobile Phone Cases". Generally it is a good purchase and I am very satisfied that I found it because I searched quite a bit for a case without bright colors that would not only fit the phone but would also let you put 1-2 other small things in it. If in the end it lasts for a reasonable amount of time for its price (update: I have already had it for almost a year), I expect to buy the same one again.