Keurig
Keurig's entire product is plastic in the water path by design. Cold water sits in a removable plastic reservoir, near-boiling water is pumped through internal plastic tubing and a plastic pod holder, and it exits through a plastic-lined K-Cup pierced by a plastic-collared needle. The company points to BPA-free materials and a recycling program for the pods, but that doesn't change the fundamental design: heat plus pressure plus plastic, every cup. This is a brand whose convenience depends on single-use plastic and plastic plumbing - there is no plastic-free way to use it as intended.
How clear are their specs?
Keurig will state that the reservoir and pods are BPA-free plastic, but it does not clearly characterize the internal tubing, pump, and pod-holder materials, and it markets around the plastic rather than disclosing the full water path.
Products to avoid
Documented so you know what to skip — each still has a full breakdown and sources.
