Jenna -
I travel a lot and generally go with my 50D or 7D and one carefully chosen lens (depending on destination), plus a small p/s like you have. THis is due to a bad back as well as shoulder surgery. So I can sympathize with your desire to go as light as possible.
My overall lens of choice is the 24-105 L, which stays on my camera 95% of the time at home as well as for travel. For images with the 24-105 L, check my May 2010 and May 2007 galleries of Greece (by sites and islands), and Istanbul, as well as Paris 2009.
For Italy and countries where I know I will need wider due to monumental architecture and tight spaces, I love my 17-40 L, but for general travel it isn't long enough. Pictures with the 17-40 L in Italy are on my pbase gallery. Italy galleries (by city) for years 2003, 2005 and 2009.
I also have a highly under-rated , (IMHO) 17-85 IS . This lens is relatively inexpensive, very light weight and has a super focal length for most uses. . My copy is very sharp. You can check out images shot with it on my Copenhagen, Oslo, Stockholm and St. Petersburg galleries on my pbase site below my name. I also took it to Egypt in 2007 and have a gallery for those shots as well.
As for as a bag... my favorite two bags that
pack flat are not camera bags, but rather Prada black nylon purses, one a large satchel type with flap over central zipper compartment, and two bellows pockets. I put an old LowePro liner inside to pad the cameras when I'm walking around with them on a city type trip. For rougher places, like Greece and Egypt, I use an unconstructed Prada black nylon "lady type" backpack. Both Prada bags are lined and very tough, having made numerous trips abroad.
I wrap my camera and a small p/s in OpTech wraps for transit in my carryon bag and pack the Pradas in my checked luggage. This has worked very well for my purposes. FWIW, I also have a wonderful Billingham Hadley Pro bag which is well padded and easy access and low profile as it is the slimmest bag I've seen in the "genuine camera bag" line, and owned a lot of them !!!
I hope this will help you see what kinds of uses each of these lenses works for as well as for some "un-camera bag" type bags , which are much less conspicuous than the usual LowePro and Kata types. .
carolyn
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Ranger a.k.a chammett
http://www.pbase.com/chammett
'elegance is simplicity'