I was shopping for a new luggage and it took me ages before I could finally find one with a smooth surface. All hard luggages nowadays have grooves and I hate how they look. Do they serve a purpose other than aesthetics?
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The grooves help the panel stay more rigid, so it can be made thinner or out of a lighter (weaker) material without causing problems. If you fold a piece of paper in half and then unfold it, you can see how the crease makes it more rigid in one direction without adding any more material.
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