Two one gallon ziplock bags over the outside and everything that MUST stay dry is in waterproof packaging already, with the whole thing slipped into a spare watch cap so the bags don't get chewed up. It's pretty waterproof.

Mine is the French copy, who's handle I like better, and it's pretty light already. Aluminum construction, and while it is thicker than the Sigg, it IS designed for being in/over/on fire.

http://i71.photobucket.com/albums/i132/ironraven/100_1276re.jpg

I learned that the second ziplock is a GOOD thing last fall when I found that friction had rubbed a hole through the single one.