(Sorry if I'm repeating what others have said.)
Good that you have socks. If you're in heavy rain or fall into a body of water, they won't do you any good if they're soaking wet. Get a dry-sack for socks and the TP, any electronics, and paper. I suggest you add underwear, a t-shirt, and possibly other clothes as well. A sweatshirt, t-shirt, underwear, socks and sweat pants can be rolled up, put in a dry-sack, sat on and sealed up to take up very little space.
You can pick up a couple rolls of toilet paper for backpackers that will probably be as much as you'll need but take up a whole lot less space than a regular roll. I also suggest getting some duct tape for backpackers.
Tinder is a great idea. I suggest getting a big glob of Vaseline and rubbing it into the dryer lint and keeping it in a small Zip-Loc bag. Having at least two lighters or more than one way to make fire is a great idea, too.
Food. Ramen noodles aren't what you want. It's lightweight, yes, but it requires water and heat to eat it and it gives you precious little energy in return. Get a few of your favorite energy bars (I like Balance bars; get whatever you'll actually eat). Trail mix isn't a bad snack - good job. Carbs will fill you up but won't deliver energy. You need protein. Swap the rice cakes for jerkey at least.
Water. Get a Camelback bladder you can attach to the outside of your bag for drinking as you're walking. Get a filtration system to keep in your bag to purify water from natural sources. Water is heavy - don't carry more than you need to. If you're in a really arid local, forget what I said.
Machete. Get or make a sheath and keep it on the outside of your bag.
Hygeine kit is good - make sure that stuff stays dry.
Having a pencil is good. Having something to write on is necessary - add that if you don't already have it. Also, throw in a permanent Sharpie marker so you can leave messages to others (eg: on the back of road signs).
The antisceptic wash and bug spray are good ideas, but put those in their own zip-loc baggies in case the containers break.
Cordage is excellent - good job. I also suggest getting a cheap tarp with grommets from Target or Wal-Mart. That way, you can easily put up shelter if you need to.
Your fire-starting kit is great, except for one thing: it is kept in a cardboard tube container. If it gets soaked, your lighters will work but your tinder and matches are gone. Either put that in a big zip-loc baggie or get a dry-sack for it.
What's the purpose of this bag? Is it to help you get home or get to some other safe location? It probably is. So I suggest keeping it with you in your car if you don't already keep it there. I suggest adding an atlas or at least a map or two of your area and a compass.