One of the primary uses of 300ml glass jars is for food storage. They provide an airtight seal that keeps your food fresh for longer periods. Whether you’re using them to store homemade jams, pickles, spices, or grains, these jars can maintain the flavor and quality of your food. The transparent nature of glass allows you to easily see the contents, which helps in keeping track of what you have on hand. Additionally, glass is non-porous, meaning it won't absorb odors or flavors from the contents, ensuring that your food tastes as it should.