We LOVE this rumble jar! After my first pregnancy I started to notice the effects of hot coffee on my GIT. Since learning about cold brew I am so grateful for this maker. I don’t have the same issues, it’s so easy to use, I love that I can take it anywhere and that there is zero waste involved. These are a NECESSITY for any coffee lover. We take it with us when we travel and when we camp. It’s great because there are no other supplies needed for great coffee other than this rumble maker, a jar, and ground beans. They also make a great gift.