It looks nice but isn't a perfect rectangular shape.

The way that it tapers at the top means less room for storage.

The ideal bag I think is a perfect rectangle, around 20" x 15" x 10" to acheieve a radius of 45" max. Of course a bit smaller is best so 20" x 14.5" x 9.5" is preferred.

The handle should be thin as to not take up precious room inside the bag. Wheels should be inset and not too large - every milimeter should be dedicated to storage space inside.

Ah, if only there was a way for me to design my own bag