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after twisting off the bottle, the cap would easily drop. sometimes it falls down to the ground and gets dirty. in order to avoid this, tumbler cap keeps its edge upwards to keep it clean.
the heaviest part lies in the bottom of the cap, so when falling, the cap could turn the bottom down towards the earth. meanwhile, its bottom has a spherical surface so that it sticks to the ground, thus reducing the possibility to get contaminated.
It also applies to medicine bottles, chemical bottles, etc.
Lu Jing Li Ke