Function: 1. The lightweight and compact capillary membrane system can effectively ensure clean and safe water. 2. It does not contain chemicals and provides at least 1,000 liters of clean and safe drinking water from any source, e.g. streams. 3. It can be easily connected to a disposable water bottle or water bag with 28mm / 1.1 inch standard thread, or you can use a silicone direct drinking straw. 4. Comfortable cover prevents dust and stains. Carabiner for easy hanging and carrying. 5. Mini and lightweight filter system, perfect for recreation, hiking, camping and outdoor emergencies. Specification: Item Type: Water Filter Straw Straw material: ABS PE Filter material: ultrafiltration membrane Product Weight: Approx. 64g / 2.3oz Filtration life: 1500L Flow rate: 550 ml / min Applicable water source: river water, lake water, stream water, groundwater, rainwater, surface water and other freshwater without chemical pollution Package List: 1 x water filter 1 x D buckle 1 x water filter tube 1 x Manual