When it's made mostly from nuts, seeds and dried fruit, trail mix is pretty healthy.
Still, go easy on it -- Calorielab.com estimates a cup of trail mix has 693 calories and 44.1 grams of fat. AddM&Ms and other ingredients that aren't so good for you, of course, and those numbers jump higher.
Trail mix keeps pretty well, but it's not immune to aging. Nuts can become rancid, and even dried fruit can pass its prime.
When Manhart makes trail mix, she sometimes makes up to six months' worth at a time. She said it does fine if it's stored in a Ziploc bag and is refrigerated.
Also, if you're going camping, consider double- or even triple-bagging it so the smell doesn't entice bears.
