A ti mug sounds good.
I've just spotted my one tour old enamelled mug has rust bubbles so I'm feeling a little un-enamoured with what I imagine to be Chinese camp ware.
The 450ml sizing, for me, is less impressive though as I like a decent sized mug of hydration to slake my thirst, be it tea, coffee or water.
I've somewhere a plastic mug bought in a fit of temper when a previous enamelled mugs enamel rusted through and the mug started weeping from the bottom.
The plastic was a bit of a bas.. illegitimate with regards staining and it wasn't more than a couple of day's into a tour when it fell from favour due to looking gross.
I did see some stainless mugs but the handle welds looked a little precarious and just awaiting a really hot brew to give up the ghost and send one for an eyeball of the local A&E ward
I'll have to have a review of the options in around 5 to 600ml.
Surly Ogre, Extrawheel trailer.