Look at the gear lists on the home page of this site (linked to in my post above), and try to aim there for weight (not the brands). The lists will also help you decide what individual items you'll need. I prefer the 7-day gear list to the 3-day list; you can use the same gear for any length of trip, and I would not want to be stuck in rain in the gear listed for the 3-day trip.

Try to have your base weight (everything but food, water, fuel) at 20 lbs. or less, and you'll be fine. Add 6 lbs. food for 4 days, a quart of water (2 lbs.), a pound of fuel--that puts you at 29 lbs.