The widest of our zero degree bags, the Ibis provides room in the shoulders while maintaining the efficient cut necessary to reduce extra space and keep heat loss to a minimum. Like the Snowbunting, the Ibis is ideal for cold ascents in the Cascades, Nepal treks, shoulder season in the Rockies, and for Mount Rainier. The Ibis also excels when you are pushing the comfort rating of bag and need space to wear a down jacket while you sleep.