I couldn't find a bag for my Pro-Tech 10" Miter Saw (Model 7101) anywhere on the internet. This one looked like it might work, so I took a chance. The compression spring on the opening fit perfectly on the Pro-Tech. I'm back in business again. Others claimed to be universal but the posts attached to those products indicated otherwise, so this is why i chose the RYOBI instead.
This is a good dust bag, but be aware of its connector size: the opening only fits up to a 1.75" connection to your saw. If the diameter of your saw's output tube is larger than that, this bag won't work for you.
I tried to figure out a way to do the job without buying the bag, but there was always a big mess and a big clean up. Once I bought and used the bag, a major time saver for the price. A right tool for the right job.