Talk To Me About Jar Food Storage

Cookie Jars, Ingredient Jars, etc. What do I need in a cookie jar to keep the cookies fresh? Is there a specific type of jar which keeps ingredients like baking soda or flour? Are there any cookie jar like containers for keeping bread longer?

I recently acquired an earthenware jar for things like honey, and it got me curious on what can and can't be stored in these type of jars, as well as what's required to make a jar like that keep things.