Osprey. Their sizing options are really good, and they make the most comfortable packs I've ever used. (Plus they will repair or replace if something goes wrong.)

Whatever you choose, I highly recommend going to a store and trying the pack on in person. REI and probably other outdoor stores will help you fit it and let you put some weight in it and walk around the store for a bit to make sure it's comfortable.

I love them. I've never had a problem with any of their gear personally that would warrant using the warranty process, but a couple of my friends have used it (US, though, not Canada) and had a good experience.

Everything I have has held up super well. Plus Patagonia holds its value pretty well; if you no longer need something or your size changes it's generally easy to resell, and if you don't want the hassle, you can still get pretty decent credit for it just doing Worn Wear.

If anyone's interested in reading more about the overseas drug industry, I highly recommend Bottle of Lies by Katherine Eban.