I've used it for the last 8 years to carry my Art&Lutherie acoustic guitar.
Very comfortable to carry around when busking, offers a good protection to the instrument and the extra pockets are quite big, i was able to carry also some cables, a kalimba, some harmonicas and a melodica.
The little comparments inside the front pocket are not very durable, i used them to carry the picks but after few years the zip broke down.