bakwoodjwrote a review of Platypus Platy Plus Bottle on December 16, 2015
Familiarity: I've used it several times
I carry one or two 1 liter sized bladders in my pack so I can have extra capacity with very little added weight. They usually travel rolled up with a rubber band keeping then tight. They weigh in at 0.2 oz, if memory serves. I carry a 32 oz plastic bottle for use throughout the day so these give me the capacity to carry up to a gallon of water if needed without weighing down my pack. Water is heavy enough so I keep the containers as light as possible.