A flask/mug and plunger combo: keeps your coffee warm, even in the snow!
[Update]: This awesome mug doesnt seem to be on sale any more: these are 2 good options – Primus LiTech Coffee Press and GSI Coffee Press (see Comments links below for where to buy):
Update #2: Liquid Solutions which is supplied by the same people ‘Pacific Cornetta, Inc.’ that make the above Marmot one have this one called the “Frosty” coffee mug which looks pretty good:
They also have a taller model called the “Hector” Frosty Mug avalable on Amazon.com
Also some nice options for Tea leafers here too: http://shop.liquid-solutions.com/brewingmugs.aspx