Why do coffee packs have an aroma hole if it is recommended to store coffee in an air tight container

This is a hole punched before installing the degassing valve, which purpose is to discharge the CO2 released and avoid the oxidation of coffee.

What is That Hole in Your Coffee Bag

Everyone would notice a small hole in the coffee packaging bag, this small hole is the breath channel of the one-way degassing valve.

How Does a Coffee Bag One-Way Air-Valve Work

A high-quality coffee valve can promptly discharge carbon dioxide from the coffee bag without allowing outside air to enter the bag.