When I was a young boy we had a big hornets nest built into the hitch of a piece of farm equipment. We needed to use the equipment, so they had to go. Real early in the morning I went out with my dad, he brought along just a heavy duty plastic bag. He slipped the bag over the nest, detached it, and knotted the bag. We ran back to the house with the bag buzzing wild...and dad put them in the basement chest freezer. I don't know how long they lasted, but it was lights out when we checked the following day.