The Big Zip SL Hydration System by Platypus is now more durable than ever and loaded with improved features, like the new easy-to-clean wide-mouth SlideLock closure with secondary reinforcement so you know it's sealed securely, and a quick-disconnect valve for removing the reservoir from a pack without re-routing the hose. Other upgrades include a redesigned, easy-to-use shutoff valve and a softer, more flexible, but still taste-free reservoir.
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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