I looked at this backpack for a long time, compared it with competitors, but did't find better quality.
It looks pretty small, but it holds a lot of stuff, like my boxing gear along with a shoes, t-shirt and pants.
Also, worth noting, that the backpack has a lifetime guarantee. So far I haven't had to use it and I think that I'll hardly have to, since the backpack is well sewn and seems pretty reliable.