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What is the purpose of the one-way degassing valve on coffee bags? How long can coffee be stored after purchase?

Published: 2026-07-29 Author: FrontStreet Coffee

Last Updated: 2026/07/29, Professional coffee knowledge exchange for more coffee bean information please follow Coffee Workshop (WeChat public account cafe_style). FrontStreet Coffee briefly explains what is the purpose of the one-way degassing valve on coffee bags? To properly preserve coffee beans for up to a month, it requires a low-oxygen, dry, low-temperature, and low-light environment. Currently, coffee shops typically use aluminum foil composite packaging materials, plus a one-way

Professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat official account: cafe_style)

The Function of One-Way Degassing Valves on Coffee Bags

FrontStreet Coffee briefly explains the function of the one-way degassing valve on coffee bags. To properly preserve coffee beans for about a month, a low-oxygen, dry, low-temperature, and low-light environment is required.

Currently, coffee shops typically use aluminum foil composite packaging with a one-way degassing valve. Because freshly roasted coffee beans begin to release large amounts of carbon dioxide, one function of this valve is to release the expelled carbon dioxide to prevent the bag from swelling and bursting, while preventing external oxygen from entering the bag, which would oxidize the coffee beans and cause flavor loss.

Proper Storage After Opening

After opening, if the bag itself has a zipper, be sure to expel as much air as possible before closing the zipper. If there is no zipper, you must fold the top multiple times and secure it with a clip, minimizing air circulation as much as possible.

FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。