I brewed yesterday using muslin hop bags with hop pellets. I noticed that the bag was pretty stiff after I tied a knot and thought that this may end up hurting my hop aroma, flavor etc since the surface area of the hops is drastically reduced when bundling them up in a bag like that. This technique is used in cooking alot as well, where one will use cheese cloth and create what is called a sachet bag filled with herbs and spices and throw it into the stock pot to boil or simmer with the rest of the ingredients. However I always felt this was doing the same thing, of reducing the efficiency of flavor extraction. What is the general opinion about hop bag usage?