1. 5-STAGE FILTRATION: This upgrade 5-stage filtration system includes a coarse filter screen, double-layered pp cotton fiber, coconut shell activated carbon, and hollow fiber ultrafiltration membranes. 2. LIGHTWEIGHT & EASY TO USE: Looking for clean drinking water while exploring the great outdoors? Look no further than this survival gear, which features a mini and lightweight filtering system that is perfect for camping, hiking, and other outdoor activities. 3. HIGH QUALITY & DURABLE: Not only is this straw filtration system made from high-quality materials, but it also versatile filtering modes. It's smaller than other filter straws on the market, making it more convenient to use, and it can be connected to a soft water pouch or disposable water bottles for squeezing. 4. LONG LASTING USE & EASY TO CLEAN: Both ends of the upgraded straw filter are removable for easy cleaning, ensuring that it lasts longer and provides up to 5,000 liters (1,320 gallons) of drinking water. The flow rate is optimal at 500ml/min, while still maintaining the filtration accuracy.