Overview & background
Bird's nest (yan wo) is one of the highest-value foods in the Chinese-speaking market, and its packaging is built to prove quality through visibility. The straight-sided jar exists to show the strands and clarity of the product without distortion, which is why it is made in high-flint glass with a near-cylindrical body.
The format has carried over to other premium tonics and supplement drinks that borrow the same 'see the quality' positioning.
