Pretty Cool "The first real handsfree backpack umbrella." "The innovative trekking umbrella is easily fastened to any standard backpack with hip belt and directed into the wind and rain. Both hands remain completely free which is ideal for walkers who don't want to go without trekking poles in the rain, either"
He'd likely have a black one of these stashed wherever, or something similar. Multi-Purpose 1 day pack ( FirstSpear is a brand created by former U.S. servicemen, they develop enhanced light-weight load carriage solutions for the US Special Forces )