Muslin hop bags are small, loose bags made of a muslin cloth that allows liquid to easilypass through, allowing your beer to come in contact with the contents. This makes them ideal for boiling hops or dry-hopping. However, you can let your imagination be your guide and add almost anything in your beer with these bags! Coffee, oak chips, spices...you name it! Add extra character to your beer by adding some extra ingredients with these muslin bags.