Perhaps an odd thing to ask, but what are you packing in your backpack for coffee? That sounds lovely, but between the need for hot water, the subpar quality of most powdered coffees, etc, it has seemed out of reach.
For multi-day trips I already have a small camping stove (MSR PocketRocket or an alcohol stove), and I pack instant coffee. I heavily prioritize saving weight on longer trips, so I generally drink my coffee out of the same light plastic bowl that I just ate oatmeal out of, which doubles as a decent way to clean the bowl.
For urban backpacking the more high end thermoses are really effective at keeping stuff hot once you've made it.
I have several friends that really like their Fellow Carter Everywhere mugs if you want an alternative.