They fit like normal bags as described but are a little thinner and can tear and are easier to put in the vacuum cleaner. Otherwise they're fine and do the job - if you change the bags after every cleaning it's no problem that they're thinner. I left my vacuum behind as I wanted to do more the next day, but the kids were a million distractions and the smell of cat hair/litter was evident two days later when I went back to work.