K-Cup brewers and pods

K-Cup is Keurig's pod format: a plastic cup of ground coffee with a paper filter inside and a foil lid. The brewer punctures the lid and the base, pumps hot water through at low pressure, and fills a mug. It is the dominant pod system in the United States, and far more companies make pods for it than for any other format.

A K-Cup is a single cup of drip coffee

There is no espresso pressure anywhere in the process. Water passes through the grounds and the filter much as it does in a drip coffee maker, only one cup at a time. A pod labelled espresso roast gives you a dark mug of coffee, not a shot, which is why a milk drink built on a K-Cup tastes weaker than one built on a capsule espresso. That is not a fault of any brewer; it is what the format is.

Cup size is the strength control

A pod holds a fixed amount of coffee, and the brewer lets you choose how much water goes through it, often from 4 to 12 ounces. Every step up dilutes the same dose. If your coffee tastes thin, choose a smaller cup before blaming the pod, and use the strong setting where there is one, as on the K-Elite, which slows the water so it spends longer with the grounds. Pods sold as extra bold contain more coffee, and they make a real difference at the larger sizes.

The format is open, and that once mattered a great deal

Keurig's patent on the cup expired years ago, and roasters of every size now sell K-Cups, from supermarket own brands to Peet's Coffee and Death Wish. Keurig once tried to lock its 2.0 brewers to licensed pods, customers rejected it, and the company backed away. Current brewers take any K-Cup, and most accept a reusable mesh filter, which some, like the Cuisinart SS-10P1, include in the box.

The plastic question

K-Cups were long criticised as unrecyclable. Keurig now makes them from a plastic that some local schemes accept, but only once the foil is peeled off and the grounds emptied, which few people bother to do. A reusable filter sidesteps the problem and brings the cost per cup down to that of ordinary ground coffee. Which pod systems stay open explains why this format is the easiest to live with.

Who it is for, and who it is not for

It suits a household that drinks mugs of black or milky filter coffee, values choice and convenience over espresso, and wants pods on sale in every supermarket. It is the wrong system for anyone who wants espresso, cappuccino or a flat white with a real shot underneath; that needs a pressure system such as Nespresso's Original line. Our best K-Cup coffee makers and best K-Cup pods rank what we have reviewed.