Features: brand new and high quality SIMPLE AND HIGH EFFECIENCY. The water filter straw built with 0.01-micron ultrafiltration membrane which can remove 99.9999% of the tiny material and harmful substances. The water purification can improve the taste and odor. EASY TO USE. No need for any external aids to filter water into a clean, safe drinkble water immediately, including river, well, lake, stream and tap water, etc. COMPACT AND PORTABLE. Small but bigger capacity, this hollow-fiber UF membrane water filter system will provide up to 5000 liters of safe drinking water. Water filter lifespan can be extended by clean water backwash. Ultra-compact and lightweight, weighing only 135g. VERSATILE USES. Simply fill up the included water pouches at a lake or stream, screw the water filter straw onto the pouch and squeeze the pouch to push the water through the filter. It is easy to absorb water and can quench your thirst instantly. Fits for most 28mm threads bottles. EXCELLENT WILDERNESS ASSISTANT. Whether you're hiking, biking, backpacking, traveling or basecamping, this water purification system offers flexibility and options. Especially for emergency preparedness to meet the emergency water demand in a variety of situations. Specifications: Material: ABS Color: Black; Gray Fit for: 28mm Screw Mouth Bottles Size: Approx. 14x4cm/5.51x1.57in Weight: Approx. 135g Package Includes: 1 Piece Mini Water Filter Straw note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!