DESC: Don't panicyou didn't forget to pack a sleeping bag. The Marmot Plasma 30 Sleeping Bag in your pack is just so compact and lightweight, it may feel like you left it behind in your garage. This technologically advanced bag features a Pertex Quantum shell that is 25-50% lighter than standard sleeping bag shells, and lofty, highly compressible 900-fill down insulation. That's right, 900-fillthe highest fill power available.