What is on my list of researching at some point in the near future is a to go cup from the EU. I have been using a keepcup for ages and while it still does it’s job it’s made from plastic and I have been a lot more sceptical of heating food / putting warm beverages in plastic containers. It might be very easy to find a glass or metal cup but maybe it wont be. I would use it for drinking coffee mainly, i already have a metal bottle for water but because that system is easier to get right it didn’t require any research.