The LifeStraw Peak Series Gravity Water Purifier is a portable, high-capacity water purification system that removes viruses, in addition to bacteria, parasites and microplastics from drinking water. This rugged, 8L system boasts a high flow rate of 30L/hr and has a lifetime capacity of 18,000 liters - about five years of safe drinking water for a family of five. The product is ideal for emergency preparedness and survival situations as well as camping, adventure and international travel. The kit includes a leakproof cap, custom backwash syringe, and hang strap with carabiner for easy hanging and carrying. The system functions exclusively off gravity and does not require any pumping, batteries or power sources.