Make your own cold brew the eco-friendly way with the CoffeeSock Cold Brew Coffee Kit! CoffeeSock filters are a reusable alternative to paper filters and nylon sacks. This filter out-performs any comparable disposable and reusable filters. Cotton absorbs some of the oils released from coffee beans yet lets acids pass through. They are durable and may last a year or more! Kit includes a 64 ounce canning jar and a reusable organic cotton filter. Made by a women-owned business based in Austin, Texas.