The Ka-Ku Cold Brew Tea Bottle (1200ml) makes brewing tea simple, beautiful, and part of your everyday routine. Designed for cold brewing, it allows tea leaves to gently infuse in water over time, resulting in a smooth, balanced cup with clear flavor.

The slim glass bottle fits easily in the refrigerator door, while the built-in filter keeps leaves contained for clean pouring. It’s an easy, thoughtful way to enjoy tea at your own pace, whether you’re brewing overnight or letting it steep throughout the day.

HARIO is a Japanese glass manufacturer founded in Tokyo in 1921. Known as the “King of Glass,” HARIO is the only heatproof glass maker in Japan with its own factory and a long history rooted in laboratory-grade precision. Their products are made from 100% natural, lead-free borosilicate glass, valued for its heat resistance, durability, and purity. More than a century later, HARIO continues to produce beautifully functional glassware that’s trusted in homes, cafés, and labs alike.