volume to surface area II

Continuing the exploration of the volume to surface area ratio in my world.

grapes
The skin of grapes don't taste so great. Little grapes don't have enough volume to compensate for their bitter surface area. The grapes I bought today are probably no bigger than a dime in diameter (they're spherical). A shopper with her wits about her probably would have noted, "Hey, there is not enough volume relative to surface area on those grapes."

Reese's peanut butter cups
I like those things. Specifically, I like the big ones because they have more filling relative to the skin. The volume to surface area ratio is potentially the same for both, the big ones and the little ones. Unfortunately, the surface is so thick, that on the little ones, there is hardly room for fillings. So the big Reese's peanut butter cups are better. So one must also consider the thickness of the surface, which infringes on the volume it contains.