Have you ever noticed a dent at the bottom of wine bottles, jam jars and even your favourite Nutella jar? These days even normal mineral water bottles have it. This seemingly useless dent is not only a design feature, it has functional purposes as well. Remember that one time when you balanced a bottle on your fingers? Well, this small dent was working hard to make sure the bottle does not fall off. But, has it ever crossed your mind if there are more reasons why most bottles and jars have a dent at the bottom?

It makes it easier for you to hold the bottle. The dent acts as a spot where you can place your palm or thumb and use the other fingers to wrap around the base.

It provides an optical illusion to your eyes, thus, tricking you into thinking the bottle is bigger than the standard size.