I find the fatboy standard to be almost too small for the things you list....depending on your camera.
I am tempted by the fatboy jumbo but have not ordered one as I am afraid is may be too small also.
The construction and hip hugging action of the fatboy is very good. It carries like a shoulder bag and to me at least does not look like a purse.
If you found something 1/3 or 1/4 the size of a fatboy I cannot imagine fitting anything in it.... let alone a can of pop and camera.