Edit: Oops, you already have a pack.
I was going to recommend looking for a "Golite Jam 2" on Gear Swap for $50-60. They come up about once a month. If your pack is in fact too small, you may want to try it. Not too pricey, and I find it to be comfortable, practical, well designed, durable and its volume to be very versatile.
BTW, I got my pack first as well, you have to carry it all in something. It was a very small volume pack too, but I had money to spend on a compact sleeping bag, down sweater and tiny tent. I'd say with something like the Jam 2 you won't have to worry about the volume using your present gear and as you go lighter. It's 3100 cubic inches, so if your pack is close to that, you should be good.
- 3L Platypus probably weighs a lot less than the Camelback.
- 710 ml Gatorade Bottles instead of the Nalgene. Still wide mouth to mix drinks, packs easy being slim and tall.
- Not sure about the kabar, if you like it carry it, but my most used knife is my Swiss Army Classic. The scissors and tweezers are very useful.
- If the poncho doesn't work out, look into the Driducks Ultralite 2 for around $15. Completely waterproof, breathable, you can use it as a windshirt/windbreaker/sorta maybe protect my down jacket from sparks all purpose jacket. Just fix with duct tape accordingly.
- Use scentless trash compactor bags ($5 @ Ace Hardware for box of 20) as packliner instead of packcover and drybags.
- For food, unless you don't plan on hot food, I'm a big fan of this dehydrator . Seriously easy, and the weight you save on food/easy preparation is awesome.
- What are you using for a pot? A lot of people use the big Heinken cans (almost free).
-make a pot or freezer bag cozy from reflectix (dollar store windshield sun protector), so you can save on fuel and don't actually have to "cook" your food. See this . You can make this stuff if you don't want to pay for it.
-Keep an eye out on Gear Swap for an "EB (Eddie Bauer) Downlight Sweater" for around $45-65. It may be overkill for your neck of the woods, but it's superwarm and compresses really well. With the driducks you're good down to near freezing for well under $100.
The biggest easiest weight, and more importantly bulk, savings was from re-evaluating my clothing (rain and warmth) and food. With the down jacket and dehydrator I was able to shave a lot of weight and free up a lot of space in my pack. Everything else, use what you got and you'll figure it out soon enough.