The Fat Trapper is a plastic, airtight container that holds a replacement bag. Simply pour cooled cooking grease into the bag, seal with zip closure, and replace the lid. It eliminates spills and odors, while protecting your residents' plumbing system. When the bag is full, simply remove, seal, and discard. As you know, grease blockages in sewer pipes are a direct result of grease that is poured down the drain. The Fat Trapper is the answer to proper disposal of unwanted cooking grease and is already in use by various Waste Water Departments around the nation to help them "Trap the Grease." These are the new Fat Trapper Bags with an improved zip closure. With the new bags you will need to fold in the sides to form a square such as the existing bag did. If you make a fist inside the bag and fold the sides it fits exactly in the Fat Trapper canister.