Amazon.com : Ultimate Direction Blazek Hydration Ultra 。Really nice hydration pack/running vest from Ultimate Direction. Great for hiking/trail runs/races. It’s one size, but speaking in practical terms, this will best fit a XS through Medium. It likely won’t fit well if you have a large chest. Condition: great to excellent The reservoir is included and is clean, but has been used at least once Lady long-distance runners will revel in the comfort and capacity of the Ultimate Direction Women\'s Wink Hydration Pack. Its included 70oz hydration bladder allows runners to stay properly hydrated, and a zippered main compartment stows a rain jacket for those grey sky days. The vest-like design keeps the pack riding high, while the mesh back and straps wick moisture and remain well ventilated on hot days. Two mesh pockets keep energy gels close at hand so you don\'t crash before the final stretch. — The pack has a capacity of 7 liters and includes a 2-liter (70 oz) hydration bladder. — Features include a women-specific fit, seamless back panel, and multiple stretch mesh pockets for storage. — The pack is lightweight, weighing less than a pound (approx. 444 grams) when empty Details - Cool wick Air mesh straps and back - 210T nylon mini ripstop fabric - Women-specific shoulder harness support - Seamless back panel - Height-adjustable sternum strap - Two zippered compartments - Stretch mesh rear pocket with bungee - Two stretch mesh front pockets - Two zippered front pockets - 70oz reservoir included [1770]