I understand where you're coming from, I used to be in the same boat. I'm excited to hear Davy's response, since he spent so much time selling packs.
Most people use internal frame packs these days, but that alone doesn't mean it's the best solution for you. In my mind, external frame packs have pros and cons to weigh.
External frame pros:
- they typically have lots of great pockets for organization (though many internal frame packs do this too)
- ability to carry insanely heavy loads (Pro? Con?)
- typically quite durable. They take a beating and last a long time (though many internal frame packs have this quality too)
- the ability to have your big items outside of the pack (Pro? Con?)
- ability to haul tons of gear (Pro? Con?)
External frame cons:
- weight. External frame packs are often a bit heavier than their internal frame counterpart (but not always)
- Bulky. They whack a lot of braches and snag on things since they're so big
- having to carry big items outside the pack (pro? con?)
- selection/availability. There simply aren't a ton of external frame packs to choose from these days.
I now use an internal-frame pack. In my opinion, external frame packs get you in the habit of lashing on all sorts of huge stuff: sleeping bags, sleeping pads, tents, etc. This allows you to carry heavy and bulky loads long distances, but do you really need to be carrying heavy, bulky loads in the first place? If you can break that mentality, an internal frame pack can be great. If you have a huge sleeping pad and a huge tent, it's going to take up over half of your pack with an internal frame pack. It took some paradigm shifts to make the change, but now I don't miss my old external pack.
I can think of a few reasons why I prefer my internal pack over my old jansport external-frame pack (which I loved when I had it)
Internal frame pros:
-
typically lighter (though some internal frame packs are super heavy)
- it rides much better on my back, and the hip-belt doesn't dig into my hips. It rides like a sloth hanging onto my back, instead of a 3x4' piece of plywood lashed to my back, whacking branches all along the trail.
- it keeps my expensive items protected from the elements
inside my pack. I don't want my sleeping bag hanging off the bottom of my pack externally. It's more prone to getting soaked, getting rips, stains, encounters with sticks, stones, water, etc.
Internal frame cons:
- if you have huge and heavy gear (sleeping bag, pad, tent, etc), some internal frame packs make it awfully difficult to fit your bag into your pack.
- max weight capacity is lower (this could be a good thing or a bad thing)
- no room for your bulky gear. Putting your huge sleeping bag in and out of a tiny pocket at the bottom can be a major chore. Pick an internal pack with big, easy-access pockets, or get a nice tiny sleeping bag (which solves lots of other issues too).
Here are some more ideas on the subject:
http://www.backpacker.com/gear/ask_kristin/335
Hope that helps.