Eagle Creek used to make a really great little pack, smaller than Rick's bag, with an internal frame. Rick sold it from his store, which is where I got mine.
Alas travel bags have bloated and ballooned and I think the smallest pack you can find today with an internal frame is just way too big.
If anyone knows of a small bag--about 2000 cu. in.--with an internal frame, I hope they will post that information here. I don't think you can get one, though.
The good news is that if you do pack light (which you should! And you are!) you can get by with just a rucksack (by which I just mean a travel bag with no frame).
On the bright side, a bag like that is pounds lighter than one with an frame inside. On my first trip to Europe we lived out of two 1200-cu.-in bags for 3 weeks (and, it was our honeymoon).
So although you may be out of luck if you want a small bag with an internal frame, I really think you will be OK anyway.