Here's my approach to gear you need:
For the ultralight mentality, you want your 4 key items to weigh less than 3 lbs each.
- A good light pad that's warm. I use a Thermarest neo air X-therm. Some people love 'em, others hate 'em. I love mine.
- A good light sleeping bag. I like down, but you have to make sure it stays dry. I have a western mountaineering megalite that I love for temps above 20*. It's not the lightest thing out there, but it's not bad
- A good light backpack. The golite jam 50 is a fantastic pack for $109, and superlight
- A good light tent (this is a lot tougher to do). I splurged here, but there are some great options out there for cheap, especially if you go used.
I've got my base weight (pack, pad, bag, tent) down to 90 oz (5.6 lbs)!
I used to hate hiking, but now that i've got my pack weight down so much, I enjoy it more than ever!
Here are a few other items I love:
- Sawyer Mini water filter. Super small, barely over 1 oz, and you just squeeze the water bag and it comes out purified. Very similar to a gravity system
- alcohol stove. These aren't for everyone, but I'm a huge fan. this is the one I have:
BS 2.0 silver kit
- lightweight cook pot. I'm weird about aluminum and the effects it has on your body, so I opt for titanum. I have a MSR titan pot that I love. My stove, fuel, and matches all nest inside it.
- Layered clothing, and not too much clothing. I used to take 2 extra pairs of jeans, 4 extra socks, 3 t-shirts and 2 hoodies for a 3-day trip. Now I've learned how to layer and I only have one of everything I need (except for underwear and a second pair of socks for sleeping)
My approach won't work for everyone, and I'm sure lots of others will argue that their stuff is better (which it may be), but this is what works for me.
Best of luck. Just remember that you don't have to spend tons and tons of money for a decent lightweight setup (that's what the book is all about). Happy hiking.