Light is right and less is more, especially when you are backpacking. A lightweight pack is safer and more comfortable, and more FUN, than a heavy pack full of overbuilt and unnecessary stuff; and it makes the backcountry more accessible for anyone who does not want to (or cannot) carry a traditional pack, which should be everyone but the masochists among us.
My first day of "backpacking" was my first day on the Appalachian Trail in 2002. I had spent ample time in the outdoors -- as an adventurous child, a car camper on family vacations, and a summer camp counselor -- but I was not a knowledgeable backpacker, and certainly not a knowledgeable long-distance backpacker.
Frankly, I had no idea what I was doing, besides trying to make a crazy idea (hiking to Maine, from Georgia) a reality. I did, however, have an idea about what a backpacker is "supposed" to look like, at least according to photos in Backpacker Magazine and the REI catalog, posters at the local outfitters, and backpackers I'd seen in New Hampshire's Presidential Range. Those impressions told me that, in order to go backpacking, I needed carry a monstrous pack with lots of stuff lashed to the outside, wear superfluous layers of clothing, and don a pair of heavy hiking boots. There did not seem to be another way.
I did exactly what I was supposed to do: I loaded up 49 pounds of gear and food inside of a pack that weighed 8 pounds (empty!), and started north from Springer Mountain.
Bad idea! It took me just the first hill to realize that the 49-pound load on my back was NOT my friend. In fact, my journal entry from that first day includes a long list of stuff I wanted to throw out or send home as soon as I had the opportunity. My 49-pound load was:
By the time I had reached Maine I had whittled my "base weight" (the weight of my pack minus consumables like food, water, and fuel) to 16 pounds, and I had watched the "fun factor" go in the inverse direction -- up -- with every pound that I shed. At the same time, my safety and comfort increased.
Since the Appalachian Trail the weight of my pack has continued to go down, to the point where nowadays my 3-season thru-hiking base weight is ~7 pounds and my 4+ season base weight is a mere 14! The weight of my pack has gone down as:
Sadly, my story is not unique: most people "go (really) heavy" at first, until they realize that overbuilt products, overloaded packs, and clunky hiking boots do not equate to comfort, safety, or fun in the backcountry. In fact, it's just the opposite: you are more comfortable, safer, more mobile, faster, less injury prone, and less environmentally-destructive when you "go light." Hopefully people discover that there is another way before they give up backpacking for something that doesn't feel like "work," which isn't fun.
The "How to Go Lite" section of GoLite's website contains a host of informative and valuable articles, many of which I contributed to. I would encourage you to check out the entire section, but if you are short on time then I would at least recommend you read the following ones:
I would also encourage you to buy Lightweight Backpacking & Camping, edited by Ryan Jordan and written by the good folks at Backpacking Light Magazine. When this book was released in late-2005 it became the new standard for lightweight backpacking education. It will save you oodles of time and money because these guys have figured most of it out for you already.