Perhaps someone already stated this, anyway... I saw a video where a guy had a great idea for dry hopping without opening the fermonster. After he put the wort in the fermonster he took the bag of dry hops and put the bag in the fermonster at the top, out of the wort, and held it there with sanitized food grade magnets. When it came time for dry hopping he just pulled the magnets from the outside of the fermonster and the dry hops fell into the beer. I will be trying this tomorrow - I'll let you know.