If you are a voice trainer (as one of my students is) you might have to carry a (portable) piano around. If you can’t find a bag for it, the only chance is to make the perfect one!
And here it is
The piano is about 3kg and to carry it comfortably, we decided to choose a 4 cm wide shoulder strap that is long enough to be carried around the body, but can be also shortened to carry it over one shoulder only.
All sides are piped and the bag is closing with a button! Well done and happy playing!