When you eat fish, you may also be eating a tiny piece of someone’s fleece sweatshirt or poly-blend socks: in a single wash of a fleece jacket, more than 250,000 microfibers can wash down the drain, and some of them can eventually make it into waterways. A new bag is designed to stop that pollution. The Guppy Friend bag holds synthetic clothes in the laundry machine, catching 99% of the microfibers in a fine mesh. After a wash, you can throw out the fibers in the trash. The surface of the bag also helps reduce shedding, so clothes lose fewer fibers overall.