I bought this bag for my fairly expensive Beltuna 120 bass compact. The bag is a perfect fit. The accordion weighs 11.3kg and I am female, so it needs to be easy to get it in and out of the bag. The zip closures are designed cleverly so that you can put the accordion in from the top, with the bag on its feet, or via a flapped opening on the side. The side access is very useful for such a heavy accordion. I just slide it in holding the straps at the top of the accordion and then tuck any excess strap behind. The zips are lined with red so that there is no chance of them scratching the accordion. The top has a cover over the zip to keep rain out. The straps are very strong and comfortable - it is very much like a hiking rucksack with chest strap and belt to help spread the load. The pockets on the front are big enough to hold your music, and have smaller pockets within them to store the little bits and pieces that usually slide to the bottom of the front pocket and vanish. This is the best accordion rucksack I've every bought. Everything about it is top quality and I am ordering another for my smaller accordion. Accordions are expensive things - it is worth spending a bit on a good carry bag.
