I use a couple of these with my ElectroVoice ZX-A1s, which are almost exactly the same size and shape of the QSC K8s.
The original EV bags are incredibly expensive and look of lower quality as QSC's.
The bags are very well built, nice solid fabric with decent padding for a light bag. Good quality zippers, nice handles and nice idea having the upper velcro opening. The side pocket for storing cables could be a little bigger, but all in all I'm extremely satisfied with the purchase.