I don't know how they measured this: Fits all common bongos - Macho up to 7.5", Hembra up to 8.5"
Mine fitted very tightly, which is not bad, but then the handle wouldn't come together to be closed with the velcro. You would have to wrinkle the top of the bag for this to happen. In this case, a shoulder strap would've been useful, but it was not provided more are the loops/hooks to attach one.