There are pretty good traveling" backpacks out there. But for the kind of thing you have in mind, my default position is to make a regular backpack double as a travel pack, rather than asking a travel pack to work as a serious backpack.
Gregory Palisade Backpack
Palisade 80 Backpack
The first thing to do is decide on the size. I should think 4,500 to 5,000 cubic inches would give you the leeway to pack all you need when traveling, without letting you overload or giving you too much to handle on planes, trains, and automobiles.
An example: Gregorys newly revised Palisade 80 ($319). Its just an excellent all-purpose pack, with a hair less than 5,000 cubic inches of room, a clean design, an excellent suspension, and lots of tie-down spots. Its also a very rugged packnot a light" design. So it should take some abuse.
Another example: Ospreys Aether 70 ($249). Its smaller than the Gregory (4,200 cubic inches), which may be a good thing. I love Osprey suspensions, and it has the toughness to hold up under extended-travel circumstances.
You might also take a look at the Eagle Creek Grand Voyage Travel Pack ($225). Its a big (5,600 cubic inches) travel pack that has a pretty good backpack suspension. You can trim the size by removing a daypack that attaches to the main bag. True travel packs have some advantages over regular backpacks, such as the ability to easily stow straps if the airline demands it. Otherwise, a large duffel is handy for stuffing the pack into when checking it as baggage.
Sounds like you have some great trips lined up, Sean. Send us some pictures!
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