What is inside a K-Cup

The kid asked what was inside the K-Cup (the coffee unit for the single serve coffee brew system). We shook and cut and concluded there are two basic kinds.

  1. Classic – “teabag of coffee”
  2. Fully dissolvable contents – like hot chocolate and “Chai Latte”

The classic kind is described by Wikipedia, and you can discern the design by simply shaking and examining an unused K-Cup.  To complete the investigation, I cut a used classic K-Cup open.  The embedded filter holding the coffee (like a teabag) is quite apparent.

During brewing, the hot water is injected at the top (through the foil seal – here on the bottom because the K-Cup is upside-down) .  The brewed coffee drains out the bottom, here visible on the left half of the opened shell.