If it does the only one I've ever tried in serious cold weather leaked. - because it sure didn't stay warm very long - (I just use a double wall plastic mug in cold weather, lighter and cheaper - dunno about more durable, my MEC cold weather mug is at least 8 or 9 years old, and my little skanky plastic cup I carry other times is so old I don't even know how old. it was scavenged from a dead scouting kit something like 25 years ago and is still going strong with me..

Bigfoot has seen the little skanky plastic cup so he knows what I'm talking about - my alcohol stove rides in it.