FWIW, I went to a titanium one after breaking a plastic one in Sweden in 2010. I was pissed (our first night on a long trail: drinking lots reduced my pack weight...) and the mug was weakened by too much whisky over the years. I trod on it and that, sadly, was that - it shattered into very many horribly sharp pieces.
So I thought the titanium one would be ideal, but it's not. It's actually heavier than the plastic one and it spoils hot drinks as I burn my lips. So I've gone back to another plastic one from Taunton Leisure, making sure not to use it for whisky. Dirt cheap, just a tad under 3/4 pint. Can just squeeze oatcake packs inside. Perfect. You may find such a thing useful instead of the aluminium?