Looking for an ultra light sleeping bag, the Sierra Designs Synthesis 35 Regular Sleeping Bag is your answer. Crafted from a synthetic insulation, with a dual zipper system, and patented self-sealing foot vents.  Bound to keep you snug when exploring. Blue / Black 20D Nylon Fabric for Lightweight Versatility Draft Dodger Collar to Help Prevent Drafts Dual Zipper System Synthetic Insulation Sierra Designs Synthesis 35 Regular Sleeping Bag Blue / Black