Like I always say, this is by no means a complete list or one that cannot be altered and tailored to one's specific needs. It is a simple starting point for beginners to springboard off. Everyone starts somewhere and oftentimes, all we need is a little guidance to think about things in ways we hadn't before.
A good quality backpack will be essential! If you want to create a bug out bag, you could definitely use your backpack for that, or you could put together a vehicle kit to keep in your car. You may want both. Prepping is personal and we all will have different needs, but making sure your backpack is not cheaply made is essential for everyone. You don't want your gear falling out the bottom or the zipper breaking three hours into a SHTF situation. Make sure you can comfortably carry it and that the backpack will hold all of your supplies.