MSR Trail Base Water Filter Kit 4L

The most versatile water filter we've ever designed, the Trail Base 4 L micro filter kit features the same smart engineering and modular design of the 2 L version with twice the water capacity for barely more weight (57 g/ 2 oz). The kit lets you use the gravity system at basecamp, the pocket-sized, take-alone trail filter for on-the-fly hydration, and the fast-and-light reservoir for hiking or biking, or whenever you want to carry more clean water with you. The kit directly connects to standard hydration system reservoirs for hassle-free filling. And with the shake-to-clean filter, it's super easy to clean-no back flushing required.

Higher volume, versatile system offers gravity filtration at camp + a small filter for the trail.