This 6 long, 9 dia makes it look like an
M&M .
I think they are using a trick to provide more volume. Probably the dished ends do not have a pole in the center, but are rather a torus extending outward from the rim of the center body. I tried to approximate this with a negative taper on the dished end. Looks like this:
The red shape is a classical cylinder with dished ends.
The blue shape has this negative taper, so they biggest axial distance is on a circle, not in the center.
Both shapes have the same length and diameter, but the blue one provides more volume.