Kelty Redwing 44 Backpack, Ponderosa Pine. This bag is hotter than ever. Seriously. The restyled cosmic down 20 degree sleeping bag now has the exceptional warmth of 550-fill hydrophobic Dri down for higher performance. That means more moisture Defense and quicker drying in the cold and wet. Versatile enough to use in 3 seasons, with great features like a thermal comfort hood and top draft collar, it's a no-brainer for backpackers who love to be outside in rain, snow or shine.