Just my observations... overall I think you're in the right ballpark but there are definitely things I'd do differently.

First, a bug out bad usually describes exactly what you're making: a bag to survive on foot for 2-4 days. An INCH (I'm Never Coming Home) bag is what people talk about when they assemble 90 pounds of gear, which I personally don't think is something worth bothering with.

That being said, * Those bags you mentioned are way too small to carry the gear you need and they have terrible load carrying. Additionally, because their "tactical" they're made out of thick, heavy fabric that practically speaking isn't any more durable than hiking-type bags (which are far, far lighter). * I'd recommend you don't keep any books in your bag, they're useless weight and are not hard to read a few times and memorize. * Rotating plastic water bottles is far cheaper than those water bags and when you finish them, you can use the plastic bottle as additional water storage. * That mylar survival blanket is absolutely useless unless you intend to treat someone for hypothermia. It's not a blanket you can use to sleep. * You should definitely add blister care to your first aid kit. I don't think you need any of the crazy trauma supplies like usually mentioned here, but moleskin or other tape is absolutely vital. * I'm not sure what you have the super glue for, but I hope it's not for first aid. * You should probably add some food. You'll be burning tons of calories and though you can technically survive for several days with no food, you'll want to eat. You don't need a whole cookset, high calorie snacks like trail mix are find in my opinion.