I've got a few questions. First, can you list the brand and model of your tent and sleeping bag? The solo tent is quite heavy, but I don't want to make any suggestions without knowing what you already have and are comfortable with. Same goes for the sleeping bag.
Second, I'm curious about your valuables and ipod. 12 oz is pretty heavy! If the book you are bringing is a novel, as opposed to a field guide or the like, perhaps you should choose between music and reading. Personally, if I'm out for a weekend I wouldn't bring any form of entertainment. Regardless, the book and your valuables totals close to 1.5 pounds! A lot of weight can be saved there!
Another easy way to lighten your load would be to replace the goretex rain jacket. The weight is one thing, but in a place like Texas Goretex is just not breathable enough. I would try to find a lighter rain jacket made of a better material. Dri-Ducks is a good option for a cheap replacement (the material isn't much better) but with some research you should be able to find a nice jacket that is MUCH lighter. Also, your cup is 6oz, which depending on the size, is pretty heavy also. How big is the cup and what is it made of?
These are the things that really stand out to me. Of course people will ask about why you are bringing 3 oz of hand purifier, 2 oz of first aid stuff, etc.. but you should bring what you are comfortable with and then take a good look at how much purifier you used over the weekend etc.. Oh, I would also bring a mini bic lighter instead of fireproof matches. This is a personal preference, but I've never had a lighter get too wet to work.
The platypus suggestion should also definitely be considered. It's an easy and cheap replacement. At the very least use something like a standard sized gatorade bottle.
There are other things depending on how serious you are, but I think these changes would be a great start!
Edit: Also, check out the community gear lists for ideas:
The gear lists
You can also search the forums using the advanced search function to find posts of people that are new to backpacking to see previous advice. Try using the terms "New to backpacking" or "gear list help" and see what comes up.
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