Use the “Whistlecap” to gather a band with your friends! Using the special cap of the bottle, you can drink or whistle easily. The tone will be different if the water of the bottle during drinking, the bottle is just like a sound box that can be changed. By rotating the cap, you can change the function of drinking or whistling. If you are too thirsty to play the music, just drink some water!
Put a smart idea in a normal cap, you will have a great surprise during enjoying a normal drink. When you see the cap, you will know how to play it obviously, and have fun with it! You can play it yourself by drinking the water to let the tone be changed, or you can play with your friends by gathering everyone’s bottle to choir. It’s an easy amusement to enjoy our living!