Most people never notice the small round dent on the side of a plastic milk jug, often assuming it is a flaw or leftover from manufacturing. In reality, this subtle feature is a deliberate design choice created through engineering and testing. Everyday packaging often includes hidden details like this, where even the smallest shape serves a practical function. The dent may look simple, but it plays an important role in how the container performs during use, transport, and storage. One of its primary purposes is to act as a flexible zone that helps the jug handle internal pressure. Milk is...
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