When I was looking for the highest quality winter bag and not wanting to sacrifice the pack space, the Green Kazoo stood out. This -18 bag is perfect luxury and packs down as small as some very light weight summer bags I've owned in the past. Full mummy style bag with easy to use side zipper. Neck support built into bag with an adjustable tensioner to increase the fill around your head. Also a very spacious internal zippered pocket just inside the front top side of the bag. Easily store a book, light, phone or any other night time essentials right at your finger tips. This bag will be the last you buy and will easily provide you the best warm, cold nights sleep you've ever had. The staff were super helpful when showing me the features of this 100% down filled bag vs other synthetic models close in price point. The biggest saving for a hiker like me is the weight and this trully is the lightest winter bag I've ever packed. Fully packed down to about 6"x9".