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Jaeseok Han's Legcap is an interesting concept. Until stumbling upon this design, I didn't realize that there was a better solution to flat drinks (namely soda) other than an extremely tight lid that is almost impossible to reopen.

Instead, Jaeseok Han's Legcap utilizes the contents itself as a sealant, which keeps the drink fresher longer. This is accomplished by simply flipping the bottle over so that is rests of the three knobby legs seen in the gallery above.