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I just use a backpack for my BK-7m. Holds the BK, all the wires, power supply, any small mixer I might need, and then the long MIDI cable and power to my Yamaha KX5 keytar. Makes it easy to transport! Pad it with packing foam to suit what you are carrying...
In the US, there's a company called Lecover
that makes dust covers for just about anything. Been using them since the early 90's!