I ordered this bag as I have a 40 minute walk to and from my yoga class, and carrying my mat in a normal yoga bag is uncomfortable on my shoulders.
When I tried the mat in the bag, I found that the weight of the mat, as it is only partially supported by the pocket and strap, pushes the mat outwards away from the back, ie the mat is not sufficiently supported by the bag.
I have contacted the company and been told that it is just my particular mat that the bag is not suitable for and therefore they will not allow a free return.