Lightweight sleeping bag, with a minimum volume after packing, designed for summer stays in nature, filling with siliconized hollow fiber Izotherm Classic, single-layer construction, anatomical cut, semi-open shaped hood, one-hand adjustable hood tightening, inner collar with regulation, two-way zipper covered with a flap, reinforced zipper flap against snagging, zipper lock against spontaneous opening, loops for hanging, inner pocket, pillow pocket in the hood, roll-up compression wrap