Advanced Membrane Technology:With ultra filtration membrane,Our straw water filter has a filtration accuracy of 0.01 microns and can filter out 99.9999% of harmful substances to ensure your drinking water safety.Removes various of metal substances, eliminates strange smell in water, no chemical smell. Eco-Friendly, Lightweight and Portable: Our camping/hiking water purifier is up to 1500 liters (396 gallons) of water purification, thats a replace up to 3000 plastic water bottles, very environmental friendly. With 8.3 x 1.2 portable size and 2.1oz net weight, this survival gear really takes up little space and is convenient and easy to store in your bag, hold in your hand or hang on your neck, perfect for outdoor activities. Easy to Use and Clean: Put the straw into water, blow air into the straw and suck water tightly. The flow rate is about 550ml/min. You can connect the camping straw filter to bottles, water bags or directly to the lakes, rivers, streams or other water resources. After use, simply blow out of the straw to keep it clean and prevent it from clogging. Special Bottom Design:The bottom of our water filter is designed with a thread, which can be used for beverage bottles with international standard mouths, and can also be connected with a silicone tube for your convenience. A Must Have for Any Adventures: Outdoor water purifiers are essential items for anyone who likes to spend time in the outdoors, whether youre camping, hiking, mountain climbing, hunting, trekking, backpacking, biking, boating, car rides, outdoor trips and wilderness adventures. Your kit can never be too prepared.