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In daily life, when we thought a bottle of shampoo had run out, there was actually still lots of liquid remaining in the bottle inner wall, and because of the unreasonable bottle-design, we can’t run out of the liquid without waste.Full-use shampoo changes the bottle inner structure: the duct drawing liquid links to the round movable bottom piece, which makes you collect the liquid remaining the inner wall to the top of the bottle(Storage Area) by just pulling up the duct linked to the bottom when you almost run out of the shampoo. It works like a injector’s piston.