As we continue to spend more and more time in the outdoors, being able to trust the water that your drinking, cooking and cleaning with is more important than ever before. That's why this year MSR, known for their high-performance water filtration gear, is introducing the Guardian Gravity Purifier, a sibling to the Guardian Purifier pump. The gravity system is designed to deliver the same virus and bacteria protection in a high-capacity form perfect for groups and families.