The Capillary Cup is a zero-gravity cup designed by NASA astronaut Donald Pettit on the International Space Station. The product is an open drinking cup designed to be used in a microgravity environment, developed from Pettit’s desire to drink water without a bag and straw in outer space.
But the whole premise of this device is that the person didn’t want to drink from something straw-like. Which a sippy cup is to begin with.