It protect your KW122 from dust and scratches during transport or when it's "resting".
It's a cover, not a bag...so the bottom it's open and you have to use the handles of the speaker for transport. It's not a problem cause you can really have a good access to all the 3 handles on the speaker, so even the top one.
The pocket in the front can be used to house the power cable for the speaker.
I would like a little bit more padding for protecting the speaker but I guess if you need better protection you should buy an hard flight case for transport.