The lid is easy to screw in tightly to prevent leaks and creates an airtight seal to store food fresh for a longer time. The opening mouth and square glass body enable you to easily fill and take out contents from jars, which also makes it convenient to clean out thoroughly. These food storage jars are great as fermentation jars for storing your kitchen spices such as pizza sauces, herbs, honey, DIY jam, jelly, canned fruits, vegetables, and more. They are also ideal for storing dry foods such as rice, flour, oatmeal, pasta, and so on.