Deep down, everyone wishes they were a camel. Life can be hard as a human, especially when it comes to instant hydration. Get hydration on demand, camel-style, with the Osprey Viper 4 Pack. This hydration pack includes a 2 liter Nalgene resevoir that fits neatly in the 4 liter bag, with room left for small and necessary items that won't weigh you down during your run, your hike, or your bike adventure. Spacer mesh panel in the back provides great ventilation, and a stretch mesh pocket for your MP3 player or cell phone on the BioStretch harness keeps the tunes or the texts close at hand.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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