A quick stop at a river or stream with the pump-action Katadyn Hiker Pro Water Microfilter lets you continue on your long trek with hydration packs and water bottles full of clean, clear drinking water. Carrying gallons of water isn't necessary when you have reliable water sources and are carrying this durable 11-ounce water microfilter in your backpack. Since it connects directly to your hydration pack and water bottles, you spend more time on the trail and less time fiddling with your water supply.