I've been wanting some bins for my shelving, but most of which have been wicker baskets and odd sizes.   I found these Fabric Bins here on Wayfair and the size was 11 X 11 X 11, a perfect square cube!  Exactly what I was looking for.   I got mine in dark grey and they look beautiful, very modern. High quality materials, seems like they will hold a good amount of weight. They are built well and has some weight to them too and you can fold them down them down if needed.   I really love these and so does my family, so I will be buying more!