I would agree with everyone else, pre-made is not the way to go!
Build it up to your specific needs, that way you get what you want and its not junk! You can do so much better when you build your own!
Ditto to the above comments. Looks around on threads about BOBs and they can provide some great suggestions. You will pay a large markup for pre-mades and most likely will have a lot of stuff you don't need. Also the store Indiana Self Defense provides prepper classes that could help you.
Yup, checking out others is always a good idea but you need to cater to your own needs. Figure out the duration of food you need, water, ammo, first aid, then add some personal items.
I built my own from "scratch" as with most of the posters above. Knowledge is the key, not "stuff." Although to answer your query and to give you some ideas, check out survivalgearbags. Good people.