I'll admit that I struggle with the whole 'bug-out' concept. My first instinct would be to 'shelter in place', the second would be to 'shelter with a nearby relative', and a distant third, 'to walk out'. I'm well covered with the first two, but I have made provisions for the third, even though my plans for that scenario are nebulous at best. When planning to travel overland, I leave the equipment matters to the experts; the US military. I don't need to reinvent the wheel, or spend a fortune. I go the the surplus store and get what I need. I have PSKs, trunk kits, containerized camping gear, daypacks, FAKs, portable food and water stored in my vehicles, garage, my provisions area, and a rented off-site storage area. By purchasing some used military rucks, cargo bags ($15), and duffles ($5), I can put together any size BoB very quickly. With the gigantic Molle II external frame backpack ($10), I can carry 70 pounds on my back if I have to, and there is a smaller pack for my (smaller) wife. I also obtained a collapsible game cart rated at 300 pounds, and a garden wagon with removable sides. I can strap the Molle II pack to the cart, or lighten it to carry and strap a lot of other gear and provisions to the cart or wagon. I doubt I would ever resort to walking out, but most of the gear required is multi-use.