Let us know what you think of the Osprey Porter 30L and 46L. Just got my REI catalogue this morning and it included a 20% off coupon! I am really tempted to try one due to the light weight of each of the above and am wondering if the 30L would be large enough to hold all that I need.

Another nice bag that is quite light weight is the Patagonia Black Hole duffel 45L. It weighs only 1.7 lbs and holds a lot, 2375 ci by my reckoning. I use packing cubes as there is no organization to speak of. The carry handles are long enough to use as backpack straps, very workable for managing an airport or train station though you certainly wouldn't want to backpack that way. Bag weight is a big deal for me: some carriers that I fly allow just 5 kg (11 lbs) for a carryon, plus my back lets me know if I've overpacked.

Looking forward to your review!