What is Single-Serve Pour-Over Disposable Filter Bag (AKA Cup-On)? An Ingenious Brewing Method for a Pour-Over Experience anytime, anywhere Single-Serve Disposable Filter Bag (Cup-On) is an ingenious coffee-brewing method that has been around in Japan for quite a while but is lesser-known in other parts of the world: Cup-on single-serve drip coffee bags (AKA Single-Serve Disposable Filter Bag). They are known by several different names but the common idea behind them is the same: The perfect amount of ground coffee for making one cup of coffee is contained within a filter bag. This filter bag is equipped with a clever piece of paper engineering to stabilize it safely onto your cup. All you have to do is to pour hot water onto the ground coffee inside the filter bag and … voilà! You have a fresh cup of dripped coffee within the shortest amount of time and with the minimum possible amount of work and equipment involved. Among other single-serve pour-over filters out in the market