Description: External filters are durable and ideal for purifying water from outside: such as rivers, streams, lakes, ponds, valleys and other sources of pollution. A must for every outdoor traveler! It can save your life and rejuvenate you in many unexpected situations! Instructions:1. Absorb the water with your mouth, absorb the water or dry it after use and cover the lid2. It can purify up to 1000 liters of water. After reaching the service life, the straw will be blocked, please clean it in timeTips:(1) Then spit out the first absorbent water(2) Please do not collect salt water or chemically polluted water(3) Do not put into the microwave oven(4) For longer life, please try to choose water with less inclusionsSpecification:Item size: 21*2.5CM/8.27*0.98inchProduct weight: about 90gUsage: suitable for outdoor travel, sports, fitness, emergencies, rescue, outdoor activities, fighting, mining, picnic, backpacking, hunting, hiking and emergencies, etc. Packing List: Water Filter*1Water Bag*1Cleaner*1Hose*1Notes: 1. Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.2. Due to manual measurement, there is a tolerance in the size of the product.