The Rab Nitron 25L Hiking Pack is a light backpack built for moving up and down mountains at any speed. The running vest inspired shoulder straps ensure close-fitting snugness and bounce-free comfort when you pick up the pace. The EVA back panel is streamlined for a body-hugging fit that flexes for free-moving mobility. Inside the 12L main compartment, there's a sleeve sized for 3L hydration reservoirs, and a port runs the reservoir's tube through the shoulder strap for easy access. There are flask pockets on the shoulder straps for quicker water breaks with bottles. Rab added external attachments for standard folding trekking poles, and there's a special attachment for z-poles that you can retrieve on the trail without stopping.