We're doing a number of overnight trips via transit now, where all we take is 1 daypack each. The downside of traveling so light is not having the space/weight for the comforts of home, like a proper mug for my tea in the morning. I won't drink out of hotel mugs; they're just plain gross with the coffee residue for last decade stuck to the bottom.

Our last trip was the last straw - I hadn't brought a mug, and all the hotel "kitchenette" had was a mini microwave and a micro fridge, and paper cups, not even spoons. If you try to microwave a paper cup, you get a very hot, very soggy mess.

So now I'm on the hunt for a lightweight, non-breakable mug that can be microwaved. I had thought of the classic camping tin cup for weight and durability, but those can't be nuked.

Suggestions?