They are large enough to fill with a blend, and long enough that I can tie a knot in them at the top to seal them.  They would have gotten five stars if the paper didn't get so blinking hot.  Other tea bags don't hold the heat like these do, so I regularly burn my fingers slightly when I pluck them out of the tea.  I noticed it when I had two different types of bags in one tea pot.  Both bags had their edges over the side while the tea steeped. When I used my fingers to pull them out, the glue-sealed one didn't feel hot at all; the t-sac was super hot.  But that is not even close to being enough to stop me buying these very convenient tea bags.