This 3-season, ultralight sleeping bag uses a clever design of water-repellent down and synthetic insulations and waterproof / breathable fabric panels for double the protection. FILL. 700-fill duck down (top) and PrimaLoft Sport (bottom). WEIGHT. Long - Left Zip: 1 lb. 12 oz. ounces. Regular - Left Zip: 1 lb. 10 oz. ounces. COMPRESSED VOLUME. Long - Left Zip: 3.7 liters. Regular - Left Zip: 3.1 liters. TEMPERATURE RATING (F). 29 degrees (F)

• With a European Norm (EN) lower-limit rating of 29°F, this bag is suitable for 3-season use
• REI double-protection design combines water-repellent fills with waterproof / breathable fabric at the hood, sides and footbox, the areas most likely to touch a damp tent wall
• On top of the bag, where superior loft and warmth are key, the bag is filled with water-repellent 700-fill-power duck down
• On the bottom is resilient Primaloft® Sport insulation, which performs well in a compressed under-bag space
• Ripstop nylon shell also features a durable water repellent finish to further protect the bag's insulations
• Performance fit keeps weight low and thermal efficiency high
• REI in-the-round design puts vertical baffles in side walls to wrap you in warmth and create a better fit than bags that use only horizontal baffles
• Contoured hood, insulated face muffler and full-length draft tube all work to keep warmth in
• Differentiated hood and neck drawcords simplify adjustments; antisnag zipper works smoothly
• Most REI backpacking bags can be zipped to other REI backpacking bags; women's bags zip on the right, unisex on the left
• The REI Flash Sleeping Bag includes a nylon stuff sack and a large cotton storage bag