Single-serve coffee container

In 1958, the Flemish Rombouts coffee company launched its pre-filled One Cup Coffee Filter for the Brussels World Exhibition. Unlike newer capsules and pods, this system consists of a single-use drip coffee filter placed over the cup. In 1964, the company began marketing the concept, gaining success in the horeca and retail sectors. The company was founded in Antwerp in 1896, and in 1966 was appointed a "Certified Royal Warrant Holder of Belgium".[1][2]

Several different systems exist:

• Coffee pods or pads are pre-packaged ground coffee beans in their own filter.
• A coffee capsule differs from a coffee pod in that the coffee is packed in a plastic or aluminum package instead of a paper filter, and it is usually designed for use with a single brand or system and is therefore not interchangeable with other systems. A patent on the Nespresso system expired at the end of 2012, and there are now rival capsules available for the Nespresso system.[3]
• A variation, coffee bags, were developed to provide the convenience of instant coffee but maintain the flavor of brewed coffee. Modeled after tea bags, they consist of a gauze bag containing a mixture of instant coffee and finely ground roast coffee, which is to be steeped in hot water for approximately three minutes.[4]
• Coffee (filter) disks or ground coffee filter rings are a ring-type variant of coffee bags made of coffee filter paper containing ground roast coffee for use in coffee percolators, which otherwise use permanent filters made out of metal or porcelain. One of the first companies to offer them was General Foods Corp. with their "Max-Pax" filter rings.

• 
  Photo of coffee bag manufactured by Folgers
• 
  A paper coffee bag by an unknown manufacturer - E.S.E. (Easy Serving Espresso Pod)
• 
  A Senseo ESE coffee pod, upside down
• 
  Used Lavazza BLUE coffee capsules, showing the puncture holes

The plastic and metal coffee capsules typically are used in a non-removable receptacle on the brewing device. The capsules have an outer ring or rim that stays dry during use, allowing for removal and disposal after use without getting the user's hands wet or sticky. Handling of a used moist coffee pod is not necessary if the brewing device has a removable filter tray. This tray is removed after brewing and inverted to eject the used coffee pod.

Coffee pods, bags, and capsules can be sized for individual or multi-serving portions. In food service businesses, pods and capsules used with automatic brewing can help to provide consistency of product strength and flavor for customers.

Paper coffee pods such as those used in Easy Serving Espresso Pod or Senseo machines have the benefit of being a fully biodegradable product that can decompose naturally, while plastic and metal capsules such as those used in Keurig or Nespresso machines either are not recyclable, or require additional processing to separate the plastic/metal container from the organic waste products.

Many capsule machines specifically warn the user to not disassemble the machine or put their fingers inside the capsule receptacle, as the devices commonly use sharp razor-edge tubes or prongs for piercing the coffee capsule during use.

Different single-cup systems are not interchangeable; some systems force machine owners to buy capsules from a single company (usually the patent owner), locking the machine owner into a single source of coffee. Coffee pods are made by a variety of manufacturers and are interchangeable between brand of pod and model of pod brewer most of the time.

Environmental activists have said that single-use coffee pods are harmful, as they are often composed of a mix of plastic, aluminium, and organic material (the used coffee) which makes them difficult to recycle. In early 2016 the German city of Hamburg banned coffee capsules from state-run buildings on environmental grounds.[12][13] There are some capsules that are plant-based and that can be compostable as bio-waste.[14]

• Coffee service
• Coffee wars