1. OUTDOOR SURVIVAL WATER NEEDS - This survival gear provides an easy and efficient way to obtain clean drinking water for your outdoor water needs. The mini and lightweight filtering system is perfect for activities like recreation, hiking, camping, scouting, travel, and emergency preparedness. 2. COMPACT and LONG LASTING - The portable and durable straw filtration system is only 7.1 inches long and 1 inch in diameter, making it compatible with any bottle, cup, or glass. It weighs just 2 ounces and can fit in your palm, pocket, gym bag, backpack, survival pack, or purse. The removable ends allow for easy cleaning, and it can provide up to 5,000 liters (1,320 gallons) of drinking water. 3. FIVE FILTRATION STAGES - Our upgraded 5-stage filtration system includes multiple layers of filters, such as coarse filter screen, double layer pp cotton fiber, coconut shell activated carbon, and hollow fiber ultrafiltration membranes. This system can effectively filter water to be clean and for consumption. 4. FINE PORES - The 0.1 microns pore size of our straw can filter out even the tiniest particles. Despite its high filtration accuracy, our straw maintains an optimum flow rate (500ml or min) for your convenience. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.