Lowe alpine airzone z duo 30 backpack description the airzone z duo 30 backpack is a large backpack for men with a very comfortable and ventilated carrying system the big zipper ensures that you can easily at your stuff the zipped pocket on top is handy for valuables the backpack features even more storage space at the front and the sides are mesh pockets for example a water bottle and the hip belt has a small pocket features backpack for men and women comfortable and ventilate