Skip to main content

MSR Trail Base Water Filter Kit 4L

MSR Trail Base Water Filter Kit 4L
Please select options Unavailable


To meet the needs of multi-activity backcountry adventurers, MSR has set out to engineer the most versatile water filter ever. The Trail Base microfilter kit features modular components that allow it to be used as a gravity system at camp, a pocket-sized filter on the trail, or a fast-and-light reservoir when you need to carry clean water with you. Whether you’re hiking, biking or basecamping, the Trail Base water filter kit offers incredible flexibility and options, making it the one filter that truly adapts to your adventure and the filtration task at hand.

Effective Against: Bacteria (99.9999%), protozoa (99.9%) and particulate. Hollow fiber filter meets U.S. EPA drinking water standards* and NSF protocol P231 testing standard.

Versatile: Modular components allow system to quickly and easily transform from a 2 or 4 L gravity system into a small trail filter and back.

Simple Transitions: Trail filter simply quick-connects into gravity system to create the complete gravity-fed filter system.

Complete Kit: Includes ultralight, durable clean water reservoir, which features our 3-in-1 cap for easy filling, drinking and pouring.

                                                                 2 LTR                                            4 LTR
Weight (Standard) 1 lb 1 lbs 2 oz
Weight (Metric) 0.62 kg 0.52 kg
Width (Standard) 6.5 in 8.5 in
Width (Metric) 12.7 cm 10 cm
Length (Standard) 15 in 15 in
Height (Standard) 3 in 2.5 in
Effective against bacteria Yes Yes
Effective against particulate Yes Yes
Effective against protozoa Yes Yes
Filter media Hollow Fiber Hollow Fiber
Filter pore size (microns) 0.2 0.2
Flow (L/min) 1 liters per min 1 liters per min
Flow (strokes per liter) 60 60
Cartridge life 1500 liters 1500 liters
Field cleanable Yes Yes
Field maintainable Yes Yes
Cartridge replacement indicator yes Yes
Material(s) Hollow Fiber PU
Country of Origin Made in the USA of US and Imported Materials Made in the USA of US and Imported Materials


MSR Trail Base™ Water Filter Kit

Part Numbers

040818109434 10943 WAT448578412