We didn't know The Brew Bag was a "favorite thing", but we're glad it is! The paragraph below is the excerpt from his site -
Whether you’re a regular BIAB’r or not, a high quality bag can come in real handy on brew day, and The Brew Bag is a killer option. These bags have a fine enough weave to keep all husk material out of your wort while allowing decent flow liquid, and they can also be used as a hop filter to reduce kettle trub. Click here for a detailed review.