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one bottle cap can make it easier to put drinks, grain, powders or etc, in a bottle with small mouth, and it can be jointed with many bottles.
Plastic bottle are daily wasted and many homes use it as a container of grain, drink, powders or etc. The problem about it is that the mouth of the bottle is so narrow so it is hard putting them inside. How can they put those things in the bottle easier?
Expansion Cover will solve the problem.
It can be used as a normal bottle cap and when you try to put in anything into the bottle, you can easily put them in by opening the cap and unfold the rubber funnel.
Daejun, South Korea
Kongju National University