Fairshare 2 Mug
Pretty unbreakable, lidded, insulated handled mug.
A good system for intentional living underground is to have a pan or kettle for boiling water, while you eat out of a different utensil. The Fairshare is big enough to hold a plastic bag full of couscous or noodles securely, so you can eat with an element of comfort without actually having to wash anything up - good for hygiene and also a water-saver.
Also, being big, it encourages you to drink more which is very good if one is living underground for any length of time, dehydration being a coctant an insidious problem, especially in cold caves where proper hydration takes a bit more effort.
Capacity 1 litre, dimensions 12cm by 12cm. Weight around 600g.