I have used Ritter keyboard bags for many year and was always pleased with the quality, ruggedness and protection their bags gave. When I decided to go back to University after my retirement to study Trumpet, Cornet and Flugelhorn I needed a bag that would stand the abuse given by a full time music student.
The Ritter RB57 has proved to be an excellent choice with room for my three instruments, music stand and lots more besided.
I would highly recomment this product.