Boys will appreciate Sierra Design's cold-weather workhorse the Big Dog. Rated to 20 degrees and filled with HeatSync insulation the Big Dog packs warmth and comfort into a cool-looking bag. An attached stuff sack won't get lost and a Sleep E-Z Pillow (included) stows in its own pillow pocket. The ergonomic hood and draft tube retain heat and a tricot-lined foot box provides additional insulation for feet. No sweat on losing your stuff sack with the Attached Storage Bag on the Big Dog.