MUSIC STORE Tasche KCS-V Maße: 101 x 33 x 9cm

I use it with Go Keys 5. Size is almost perfect (a little longer than Roland but no big deal). Because of this good fit stability seems OK, but it could do with some straps that this bag doesn't have.
However for the price it is a steal.

I'd been waiting for this size for a while, having bought one for my midi keyboard.
Those extra mm's do make a difference to the padding and protection of my keyboards.
Perfect size for Roland W30.
Very happy with purchase.