If yoursquore leaving civilisation behind for an epic weekend ride and donrsquot want to be without the all important gps devices then the brunton revolt 4000 power pack is exactly the power source you need this brunton power pack has been specifically designed to survive the wild and will charge your devices anytime anywhere this power pack features a shock absorbing silicone exo shell that protects against harsh drops to withstand the brutalities of riding kitted out with specially eng