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REI is taking an additonal 25% off clearance items until 3/20/17. Choose free ship to store, otherwise shipping starts at $ 5.99, or is free on orders over $ 50.
Osprey Rev 6 Hydration Pack 1.5 Liters [rei.com] $ 37.44
Osprey Rev 18 Hydration Pack 2.5 Liters [rei.com] $ 44.94