Backpack measuring/ordering

Here's a start: http://www.rei.com/learn/expert-advice/backpacks-torso-hip-size.html

And for the torso length, measure ALONG the spine.

Stinson,
Make sure you follow the measuring instructions for the PARTICULAR backpack that you want to buy.

The REI link is good for getting your general torso size, but for hipbelts you'll need to follow the manufacturer's instructions about measuring, because some belts are worn higher/lower than others, and that can mean a 3"-4" difference in your results.

Lots of great bags out there! You might want to go to a specialized outdoor store, and talk to their staff about fit. Then you can try on several different options, and learn what you like and don't like.

Good luck!

Everything Valerie said plus:

Other than boots, the fit of your backpack is the next most important thing. Only way to find your dream pack is to try things on…as many as you can…and with a load representative of your expected field weight. Whether you like a particular pack or not, experiencing all of the different fits will help you know what combination of elements works best for you. In this case, as with boots, experience is the only thing that will help.

re: Custom or Cottage backpacks, all of the reputable manufacturers understand the above and offer generous return policies for unused packs if they simply do not work for you. If you find a pack that interests you, order it, load it up and carry it around the house for an hour. If it doesn't fit return it and try another.

Good luck on your search.

+1 to everything said.

and

I just wish to emphasize the importance of a new pack owner understanding HOW to adjust their pack once it's properly fit. (And having just fit an new Osprey pack for one of my Scouts the other week, there are now a TON of pack adjustments to keep track of!)

I've seen waaay too many people walk out of REI with a properly fit pack, but load it and adjust it improperly (like tightening load lifters before the lower shoulder straps are adjusted.)

The lack of awareness around this will always lead to trouble a mile or two down the road.