I used my G3 the other day and the bag was partially full (about 3 or 4 uses)so I tossed it out, Yesterday I needed a vac with a hose and the Sharp was handy so I put a new bag in so I'll use it the rest of the month,I never use the same machine that often, I only use my Bissel bagless to vacuum up kitty litter so I can empty it each time, so that won't be included in the Sharp's bag, I can't stand the thought of the litter sitting in any of my machines.