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The Camelbak Ultra 4 is a versatile running vest that is designed to handle long runs. It’s got 2 liters of hydration capacity, a sweat-proof storage compartments for your keys and phone, and a stretch mesh pocket for gels or salt tabs.
The external-fill feature also lets your refill your reservoir without removing it from the pack, so you can save time on the trail. Worried that the weather might turn on you? The stretch mesh compartment expands to hold an extra layer or two. Need more than 2 liters of water? Load up the chest pockets with two extra bottles. And with two sternum straps and a hook-and-loop adjustable harness, this pack stays put no matter how rough the terrain.