I'm surprised I haven't really seen this come up. Sometimes my cough is frequent and very loud. I'd love to have a solution to muffle the sound significantly. I looked for a device last year, they sell cough mufflers for hunters. I bought one and it's a joke. Just a block with dense foam, but it so dense I can't cough into it. Like sealing your lips on a bottle and coughing, it just flies out. Maybe it works for infant coughs, but not CF ones. Particularly at the gym, meetings, restaurants, movie theaters, etc, this would be handy. I try coughing into a bunched up jacket or my hands. Just wondering if others have a good tip for this so we draw less attention.