Blue in Munich
Crocked Professional Yeti Impersonator
I was thinking about this. Back in the 90s I had 2 hatchbacks - would've been escort/astra size back then. Both took the bag, including driver straight across the boot no messing. As mentioned on the mondeo thread, each new model is larger than the previous. So probably equivalent to fiesta/corsa now. Cars seem to have a far bigger footprint now, but less useful space (from a golfers pov).
Anyway, to the OP - Peugeot 508 SW, bag +incl driver goes at an angle, plus the powerkaddy.
Part of this is the trend towards SUVs. In a traditional estate there's a bit of overhang beyond the rear axle which potentially allows for the load platform to extend the full width of the vehicle. In SUVs the wheels are much closer to the corner of the vehicle, consequently the wheel arch intrudes into that space.