DESC: The Big Agnes Lost Dog is a very versatile bag. At 18oz and the size of a water bottle, it is great for travel to backcountry huts and hostels and is a super comfortable, roomy warm weather bag.SpecsInsulation - Primaloft Sport synthetic down. Patented thermal insulation of bonded ultra-fine polyester. It is water repellent, extremely soft, offers superior drape and compresses as well as premium goose down.Exterior Shell - Big Agnes WRM fabric is very similar to Pertex Microlight in performance. Both fabrics are made from a 30D nylon microfiber and are woven in a small rip stop pattern.Interior lining - 260T nylon. Soft, breathable, and treated with a stain resistant finish.Radically sculpted pad sleeve decreases weight while holding pad secure.Perma pillow - Built in pillow sleeve. Stuff in a jacket or a backcountry pillow and it will stay in place all night.70" YKK zipper - #5 coil.No-snag zipper action is prevented by running a fabric stiffener on both sides of the zipper that keeps