This filter's size is perfect for making one proper cup of coffee. Open, fill with coffee grounds, pour freshly boiled water through slowly, and enjoy. This product is part of the manufacturer's new Frontier product family. Frontier products combine light weight and small packing size with luxury-level food enjoyment - a good choice for camping, hiking, bike touring and paddling. - The bottom is shaped to stay well on the mouths of cups and bottles - Durable steel filter - if you want familiar filter coffee, you can also use a paper filter with this product - The steel filter itself allows the coffee's oils to pass through for a stronger sensation