I dry hopped my pale ale with a couple ounces to experiment with a recipe and used a couple muslin bags. I only used an ounce per bag since the hop pellets will expand once hydrated. Just to be safe I boiled them then rinsed in star san then rinsed in water prior to adding them to the secondary. Beer turned out fantastic. The bags do float but theres enough hop contact with the beer that I didn't really see it as an issue.