Classic Series bags are our most popular sleeping bags. These semi-rectangular bags excel in nearly all situations, from backpacking to car camping, making them the most versatile in our line. With more room than standard mummy bags, they're extremely comfortable and still offer a great value with modest packed size and weight. Features Integrated pad sleeve. Never roll off your pad again Rectangular shape offers more room in foot box and shoulders Recycled mesh storage sack & nylon stuff sack included. Built in pillow pocket holds a fleece or Big Agnes Pillow Interior fabric loops for sleeping bag liners 70" YKK #5 zipper in Mystic. Mate together our left and right zip bags with same size zipper. No-draft collar seals around neck to keep cold air from sneaking in. No-draft wedge insulates the connection between the bag and pad. No-draft zipper tube insulates along the length of the zipper. Shell and Pad sleeve: Toray fabric. Ultralight, high thread-count, rip-stop nylon with Kudos FP super durable water repellency technology. Interior Lining: Nylon taffeta. LEFT OR RIGHT ZIPPER? When you are in the bag, on your back, the right zip will be on your right side, left zip on your left side.