This palm-size device-charger is as adventure-ready as you are. A rubberized exterior absorbs shock and improves grip. It’s rated at IP68, which means it’s fully dust- and waterproof. It’s also drop-proof to 2 meters, but, in one case (oops!), it careened 50 feet down a talus field and wasn’t damaged.
3,000 mAh equals about 1.5 iPhone 6 charges.