The Balloon Plug is a great bottle cap that is versatile enough to fit any bottle. It has a very special way of sealing the neck and opens only when you release the special valve. Take a look at the renders to see how beautifully it works and can be adapted to different caliber bottles.
Designers: Xu Hao, Zhao Xin, Wu Chengyang and Lin Zihan
Love it!
This is just one of those ideas that seem to make you wonder why stuff like this doesn’t exist already! So obvious, clever, and graceful.