This hydro backpack is designed with an adjustable system for comfort. The chest strap, waist belt, and side compression straps are all adjustable to accommodate different body shapes, so this pack works well for men, women, and teens. Its S-curve shoulder straps are shaped to contour your body, the chest strap minimizes bounce, and the waist belt helps transfer weight to your hips. The hydro pack backpack also includes two dedicated drawcord loops for securing trekking poles. Size XL