Winter Trips

[Bati]

plastic bags (for feet) and a good water filter (chemicals can take too much time and you'll never carry enough fuel to boil water)

[Glogg]

Sunglasses, and backups as well. I forgot mine on an overnight, it was a bright sunny day with plenty of snow, and I turned around a few hours after hitting the trailhead when I noticed the sky looking kind of purple.