The Ascender 13 ultralight backpack is so light and sophisticated that you won’t feel it on your back at all and, most importantly, it doesn’t even move. The backpack has a smart pocket for trekking poles, two pockets for bottles, a stretch pocket for a mobile phone or GPS and all this is located on the shoulder straps. A flexible mesh pocket will keep everything in place, your back will always be dry, and when you remove the foam back pad, you’ll lose another 20g of weight. So you don’t have to slow down at all when running. It is made of durable fabric and the wide, ergonomic shoulder straps make this backpack almost like a running vest. It is equipped with cords for compression pull to the body, a pocket for a 3l hydrobag, a pocket for valuables and a whistle.