Instead of merely burning your tongue, you can scald your thumb, chin, throat, nose and lips all at once with big sputtering dribbles. Not to mention go hungry.
Serious backpackers are more weight-conscious than a Slimfast spokesmodel.
They trim tags off their sleeping bags and drill holes in their toothbrush handle. While packing, they count matches and skip the salt to shave ounces, but have to accept the weight of their high-country cookware. Now they may have to worry about it blowing around in the wind instead. New titanium cookware weighs on average half as much as comparable stainless steel, is tougher, non-rusting or corrosive and lacks the bad flavor of aluminum. Picking up a titanium mug the first time is astonishing.