The platypus big zip lp reservoir has a new low profile whilst still be based on the bestselling big zip sl hydration system the reservoir is 30 percent slimmer with a streamlined design which then allows you to sit it perfectly in a pack and help the pack fit better overall the tough dual layer construction means that the platypus reservoir is brilliantly durable and will never let you down the platypus big zip lp reservoir comes with a quick release hose 90 d