It's just a nylon dust cover except on the bottom side of the bell end, which is carried to the bottom, hence providing poor protection for other parts.
On the bright side it fits bigger didge, such as the Meinl SDDG1-SI for which meinl doesn't provide an appropriate bag, and once padded with some blanket wrapped around the didge, it's pretty efficient and comfortable, the bell pointing relatively low.
I would have liked to see at least some padding on the bell area and the mouth area.