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When we drink beverages through a straw, the cup will crease due to the atmospheric pressure.We have to release the straw to make the cup go back to the original appearance, but at the same time we will be embarrassed by a lot of indecent noise.
The ordinary straw and the cover form a closed space.The cup body will be compressed because the reduction of gas inside the cup while we suck beverages up.
So if we change the even thickness into small head with big bottom, we will leave gaps between straws and the cover.So the atmospheric pressure inside and outside are consistent.It can avoid the embarrassment of making a sound or not drinking up.