Drink directly from lakes, rivers, and streams or fill a container to use your straw water filter on the go with protection against bacteria, parasites, microplastics, silt, sand, and cloudiness. Enhanced microfilter performance helps to reduce clogging from sand and silt for better flow rate. Lightweight and durable, pack it anywhere for your backup hydration, emergency, or on-the-go needs. Unlimited shelf life means no need to worry about how long its been in your emergency go-bag unused. Long-lasting membrane microfilter will last up to 4,000 L (1,000 gallons) of water, thats enough drinking water for one for over 5 years.