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Hyperlite Mountain Gear's 2400 Windrider 40L Backpack weighs barely over a pound, yet it still has enough capacity for minimalist overnights. This pack is made from the same Dyneema rope fabric used to catch climbers when they fall, so you know it will last for seasons. The Windrider also has a roll-top closure and taped seams for reliable protection in wet weather. There's an internal sleeve styled for hydration reservoirs and a loop designed for ice axes. The Windrider also has external mesh pockets, zippered waist belt pockets for valuables, and top and side compression straps for a secure load.