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Ink-bottles perhaps are easiest to knock over, which is both wasteful and dirty, since the ink is hard to clean. On the process of spilling, the special ink-bottle would prevent the ink from spilling out with a plastic pipe in the mouth. Ink would stay in to the fullest possible after tumble, no matter how strenuous the rolling is---even when the bottle is upside-down. What's more, to the bottle used for a period of time, when there is less than one- third of the ink left, there wont be any ink spill out, let alone avoid the losses of not tighten the lid. That would bring in clean and convenience!
Zhejiang Sci-tech University