Mountain equipment helium solo sleeping bag left zip if you want the lightest bag we make to help free up space on your global travels then this is it perfect for short excursions when a comfortable guest house isnt always guaranteed features helium tm 20 outer shell is very light and highly breathable 129g of 90 10 pure duck down with a minimum fill power of 700 alpine fit maximises thermal efficiency stitch through narrow baffle top stitch through quilted base mid level side sea