Why Milk Jugs Have That Little Dent — And What It’s Actually Designed to Do

close to nine pounds, yet modern jugs are intentionally made thin and lightweight to reduce plastic use and production costs. Without reinforcement, that thin plastic would easily buckle — especially as cold milk warms and expands or when the jug is handled roughly.

The solution is a built-in “pressure panel.”

The indentation flexes inward or outward continue reading …