Ecoffee Cup is made from what is claimed to be sustainable bamboo. Only problem, plastic lid and surround.
I came across this reusable coffee cup on a shelf in an Oxfam bookshop.
Lightweight, price at £7–99, cheaper than a KeepCup, but lacking in elegance of a glass KeepCup.
Bamboo sustainable and compostable, the plastic lid and surround rules it out.