Soda Bottles: The Five-Bump BottomEngineering plastic to withstand extreme internal pressure

From the show

Why it looks like that

Plastic soda bottles feature a distinct five-pointed base rather than a flat surface. This shape, known as a petaloid base, is a critical engineering solution designed to handle the immense internal pressure of carbonation. Without these reinforced curves, the pressurized gas would force a flat bottom to bulge outward, causing the bottle to lose stability and topple over.