Soy Sauce Bottle: The Control SpoutHow a second hole prevents glugging and drips

From the show

Why it looks like that

The iconic red-capped dispenser is more than just a recognizable shape; its double-hole spout is a masterclass in fluid dynamics. By adding a dedicated air intake opposite the pouring lip, the design eliminates the vacuum effect that causes liquid to glug. This allows for a steady, non-drip stream and gives the user manual control to stop the flow by simply blocking the air vent.