The Hidden Purpose Behind That Little Dent on Your Milk Jug — And Why It Matters More Than You Think

on the side of a plastic milk jug is actually a smart safety feature. As milk ages or warms, gases can build up inside the container, increasing internal pressure. The dent is designed to flex outward if that pressure rises, giving the jug room to expand instead of cracking or bursting. It acts like a relief valve, signaling something’s off long before continue reading …