A growler is a refillable container where tap beer is poured for home consumption. MBGCO sells 64 and 32 ounce glass growlers that customers purchase. It’s theirs, and they can do what they want with it. However, we suggest they rinse it out with warm water after they consume it, bring it back to the store, and we will fill it up with more beer. If it’s smelling really funky, a cap of bleach, warm soapy water and a good shake should do the trick. At MBGCO, we sanitize every growler that comes into the store before it’s filled, but it’s much appreciated to clean it out first.