Osprey's Viper 4 is a minimalist hydration pack. Lightweight and durable, it's made from double ripstop nylon material and has a 70-ounce capacity. For storage, there is an "essentials" pocket, a bungee lacing system for a jacket, and Osprey's LidLock helmet clip. Other features that will make you recommend this pack to your friends include a comfy Biostretch harness, a ventilated back panel, and a magnetic hose attachment that stays put no matter how rough the trail gets.
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