Soda cans are under pressure. They will not dent inwards. In soda cans the
bottoms (bowed inward) and tops are bowed to prevent outward bulging.

"Baldy Cotton" wrote in message
...
Far as I can tell, someone wrote:
I'm wondering why most cans have ridges around the middle.

1. Ridges around the ends would look funny.
2. Because other cans do. They don't want to feel left out, so they wear
ridges like most others.
3. Lace and bows around the middle would be cost prohibitive.
4. But the correct answer is... for rigidity. They'e harder to dent,
although, soda cans are made of thin aluminum, which dents easily, so
maybe,
5. They make milk cans with ridges around the middle because they
always have.