My first batch was a Cherry Wheat extract kit from Midwest. I steeped my grains in the grain bag that came with the kit, then re-used the bag to put my first addition of hops in. I tied a knot in the bag so the hop pellets were kind of tight in the bag with no extra room. Once I put them in to boil, they expanded quite a bit and the bag got very tight. I decided to loosen the knot and re-tie it further up the bag to give the hops room to expand and expose them to more water flow for the best flavor extraction. But, once I did this, the hop pellets pretty much turned to mush in the bag and seeped out into my wort. This wasn't a big problem because I strained it before pouring into the primary, but it made me wonder if I would get all the essential flavors and what not from the hops if they were tied tight and not allowed to fully expand/dissolve.