Axioma Portable Outdoor Survival Water Filter Personal Gravity Purifier Filtration, for.Physical filtration for outdoor drinking. Simple outdoor design, lightweight and small size, portable and easy to store.Strong adsorption, plus large contact area for water, making your drinking process easy and effortless.Selected material, durable, high-temperature resistance, more practical and not easy to damage.Remove all visible solid sediments, 99.99999% of harmful substances, and improve the odor, ensuring the st water in the worst environments.uitable for water sources in lakes and streams. The basic disaster tool in the survival bag.water filter survival camping straws bottle bag. filtration system storage emergency pouch msr. inline purification mini collapsible. backpacking purifier sawyer gravity replacement. adapter filters pouch travel kit micro squeeze.