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BikeProUSA makes several different travel cases, both hard shell and soft cover. I've used their tandem case with good results. Noticed several other manufacturers with a quick interweb search. None are cheap and you do have the mentioned problem of storing your case (if it's not a disposable) until your return.
I was in the same boat with my Specialized Sequoia Elite, front forks are carbon and wheelset not meant to pack that much extra weight (I am doing a week fully self supported). For my planned summer tour of the Oregon coast I picked up a used BOB trailer on Craigslist, might want to think about this and not have to go so light or carry a backpack.
Wow i love that rear and front bag options. You gave me hope. Thanks
A seatpost rack and bag will work fine for light touring where you stay in motels. Or a Carradice bag on the back of the saddle. Looking at the Trek website, your bike comes with either a compact 34x30 or triple 30x30 low gear. Good enough for light touring.
I do feel my bike would be extremely fast on the flats though.
Towing a full load, probably not.
It isn't the only lack of luggage capacity that makes his current bike unsuitable, it's the gearing. Correcting that will be quite expensive.