It doesn't work too well. Next time I will definitely use pellets. I put a few boiled marbles and 1 1/2 oz cascade leaf hops into a bag with draw string and went to put them in the carboy, opps, this definitely isnt going to fit so I tried rolling the bag between my palms getting it into a sausage shape and cramming it in, still no luck so I stood there pulling the hops out and pushing them in with my fingers with what seemed like half of them falling on the top of the carboy then down into my waterbath. Now after 4 days most of them are just floating around dry on top of the wort.
Bottom line, if you're using a carboy, use pellets.