Durable bag, fast flow rate, leakproof storage, easy to maintain, long filter life, versatile design Some come with "clean water" vessels like the MSR Trail Base and Platypus GravityWorks while others like the Katadyn Gravity BeFree 6L and MSR AutoFlow have a simple hose running from the bag to a storage vessel of your choice. All adapt nicely with a hydration bladder and can be filtered into a bottle if needed. Hand Pumps The All-Mighty Guarantee is a lifetime warranty whereby Osprey agrees to fix many defects at any time. No matter when you bought your bag, you can mail it to Osprey and they will fix any problems free of charge. A sleek and durable design with a ton of versatility and fast flow rate, offered at a more affordable price

To test each product in this review, we take to the trails. We run, hike, and bike hundreds of remote miles with filters in tow, guzzling gallons of water filtered and purified from trailside sources. Using a systematic test plan, we assess each system's anatomy, dissect the pros and cons, and evaluate whether a system is reliable enough to earn our favor. Each product sees hands-on and in-field experience. We also perform rigorous indoor tests to determine minute differences between products. We specifically make sludgy water samples using fertilizers, soils, and other particulates to truly test how each filter and purifier performs. Our recommendations come from experience in the field and home-based experiments that comparatively test each product's performance.

The weight settled nicely on my hips, and as the miles went by it remained comfortable. It took no toll on my shoulders or hips; the innovation in the Atmos AG delivers. Excellent design and quality, durable and lightweight, versatile filtration options, extended filter life