When we're meticulously packing for a rough hike to the top of Lone Peak to get a weekend of climbing in we pack the Therm-a-rest Parsec 0 Degree Down Sleeping Bag. With the Parsec's slim design and ultralight weight this is the perfect sleeping bag to pack when we already have to haul a rack water food and our other climbing gear up the 12-mile trail. Constructed with ripstop nylon and hydrophobic down this sleeping bag keeps warm on chillier fall nights and early spring evenings and dries quickly in condensated tents.