The Lithium 20 from Mammut weighs only 710 grams, but you don't have to do without almost anything. It has various zip pockets, a holder for your trekking poles and an integrated rain cover. The backpack is made from recycled polyamide and has an environmentally friendly water-repellent finish without perfluorocarbons. The shoulder straps are padded and breathable and the hip belt, which is also padded, has a fold-out bag for your smartphone and can also be removed. And if that's not enough, you can also leave the rain covers at home to save weight.