You can find nearly any, or at least a lot, of vintage packs on ebay if you are patient. It helps to narrow down your choices a bit, internal frame, external frame, soft pack, specific brand. Someone mentioned the revised Rivendell Mountain Works- you can't tell the new packs from the originals, I have both. Sized correctly they carry very well. If you narrow down what you are looking for I may be able to help you find something.
Class 5 Quim
Hine Snowbridge Serex
Holubar Royale Pack
Hine Snowbridge Tamarack
Lastly, the Rivendell Giant Jensen, aka, the coolest pack ever made