Big Agnes Lost Dog Sleeping Bag. The Big Agnes Lost Dog Sleeping Bag is part of Big Agnes’ system bag line with FireLine ECO synthetic insulation offering a roomy, rectangle-shaped sleeping space with an integrated Flex Pad Sleeve on the bottom. With technical fabrics and construction, 100% recycled, super-warm insulation, and tons of comfort features, these comfortable sleeping bags are designed to be lightweight enough for backpacking but cozy enough you’ll want them in the campground too. The streamlined silhouette and Flow construction increase the thermal efficiency keeping you warm from head to toe. The Flex Pad Sleeve unites easily with your pad, and as you change positions over the course of the night, will keep you from rolling off your pad. The Big Agnes System bags offer technical, roomy sleeping spaces for those who aren’t willing to sacrifice comfort or packability. Streamlined silhouette for increased thermal efficiency. Flex Pad Sleeve features stretch construction that accommodates multiple pad widths, and easily connects your bag to your pad. Free Range Hood gives you the freedom to lift your head. Jacket-style hood opening contours to the shape of your face for a comfortable, snug fit. Low-profile cordlock lets you un-cinch the hood with one hand. Pillow Barn – keeps your pillow tucked in tight all night. Free Range Footbox – creates wiggle room for your feet. No-draft collar, no-draft wedge, no-draft zipper. Exterior loops for hang drying or storage. Mate together left and right zip bags. Range : 15 to 29. Best Use : Camping, Backpacking. Size Type : Long, Regular.