It is a personal thing, so there is some overlap. I mean, worst case, I can bug out with my EDC, maybe with a stop at my car to grab the poncho, sweatshirt, and a few other little things that I'd twist into a "blacket roll" and sling with a chunk of paracord.

To me, a truck bag is your vehicle's EDC items. A good one can double as bug out gear, but it might be too heavy to carry without stripping out a bunch of items. Assuming you have a gppd bag, not a tool box.

As for bug out bags, they are something you pack for that purpose. To ME, IMHO, it shoudl be something you can grab and go with, with at least half the water carriers full, unless you have somethign like a 5L water bag. Carry that empty, fill it from relief supplies, use it as a carrier.

I use the numbers to determine how many hours you can operated out the pack comfortably. A 72-hour bag has three days of food, half of that at least of water. (I plan on 3 liters a day, minimum), some spare clothes, etc. A 120-bag is good for five days, etc.

A 1000-bag is called a bomb shelter, or an RV if it is mobile. <img src="/images/graemlins/smile.gif" alt="" />