This sparge bag is perfect for 7.8-8.0 gallon coolers, and is a simple and inexpensive way to get into all-grain brewing. The bag is made of durable nylon and reusable. Fine woven sides and coarse woven bottom prevent wort from channelling down the walls of your cooler/mash tun. Lift bag approximately 1 inch off bottom of cooler when sparging and you will create "false" bottom. Secure sides of bag around cooler with a bungie cord to keep it off the bottom when sparging. Also used as straining bag for fruit wine.