As a backpacker, a cyclist, and would-be engineer let’s be clear on something: I love titanium. Love it. Ti is light, durable, and Wikipedia informs me non-toxic as well. Also this stuff doesn’t conduct heat very well, which is great when what you want to do is hold your preferred form of boiling caffine. So, yeah the Ti-Double Stacking Mug from Snow Peak is pretty sweet.
Keeps hot liquid hot
Stackable with other mugs
Great for backcountry soups or drinks
Perfect for backpacking