Source for filter bags

I am building the Hop Filter below. What filter bag would you recommend and does anyone have a good source for them? Thanks in advance.

Go to your local Benjamin, Kelly Moore or other paint store aka HD and purchase thier 1 gallon paint strainers they are cheap keep a few spares. Check into the larger 5 gallon also if they can be cut down for your needs. Call me cheap the 1 gallon on my interior trim and door painting that nylon filter is over 2 year2 old I wash and save it filtering my gravity fed 2.2mm tip gun on a house trim and restoration for the last 2 years. A tear will be the death of it not the filtering usage.

Paint strainer bag from home improvement store.

I'd get the largest bag you can find. I think the 1 gal bags would be too small. I think you want the hop bag to roll around in the boil as much as possible.