Awesome bag for your Blackstar 12 watt. This bag is wind/waterproof (including the zippers).
You can just open the front flap (speaker) back flap connect to another unit or top flap (inputs),
without having to take the amp out to use it. Just like the amp the case is very well thought out.
The Amp has an incredible clean and dirty sound and is a tad bit gritter then the ID CORE series,
inputs for everything but the kitchen sink, I love it and with the case this is a home run.