We were trekking the Amazon rainforest when, after nine days, we got lost. Supplies quickly dwindled, and we were soon down to the last of our food and clean water. All but one of the team’s flashlights had depleted its batteries: my dual-output SureFire P2X Fury™. I’d limited myself to using its perfectly adequate 15-lumen low setting, providing us with 46 hours of runtime—enough to guide our team back to the safety of base camp. If you need a quality flashlight in the Great Outdoors, make sure it's a SureFire.