Ducan Spine 50-60 Women. Active Spine Technology meets a light weight and women's fit. Even distribution of weight reduces signs of fatigue, while the air space suspension system provides greater comfort with effective ventilation for the back. Shoulder straps, carrying system, hip belt and dimensions of the back tailored to the female anatomy. The Ducan Spine 50-60 Women adapts completely to women's needs. Pockets positioned to allow easy access while walking and the hiking backpack's variable packing volumes allow greater flexibility.