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 ) / TechNews24h.com
A “Survival Backpack” is different than a Bug Out Bag. Where a Bug Out Bag is meant to keep you alive for about 2-5 days while you flee to safety, a survival backpack needs to contain everything you need survive for an indefinite amount of time until civilization can get on its feet again (and hopefully not mess things up this time around!). Here are the most important things you need to have in your survival backpack if you want to make it through the end of the world.