5:46 p.m. on February 27, 2007 (EST)
For sizing up your load, use a trash bag, then estimate how much volume is left over. Smaller kitchen bags work great for this.
Or, fill your tub to the brim, load your stuff in a trash bag, compress it down to its smallest volume, put it in the tub, dispace the water...
As far as a pack and another man purse sized bag, I know my back hates those kinds of loads. I'd probably opt for a few of them slippery silcoat type stuff sacks and use one of those for personal items I might need outside the pack, but, also stuff it back into the pack when its time to hike with all your stuff. Hanging a bike bag, over the shoulder type commuter bag puts such an annoying side load on my spine...
I commonly travel with a 32 liter pack (a lightweight Speedlite pack made by BD). Fits inside my standard travel carry on bag, but, also carries great by itself. The bigger ones made by Go Lite seem great too, and weigh and pack down to practically nothing.
More of a fan of a top loading pack than one of them travel bags that does both, with all the side zippers and access. These tend to weigh more, and have more stuff to break. Of course, you can disguise yourself better as a non backpacking traveller with one of them bags, though. But you are going to Europe. Tons of folks travel with packs there.
Less is more. Get some synthetic travel clothes. Ex Officio etc stuff. Sierra Outpost sells that stuff all the time, and, its light, takes up little space, holds up well under use, drys quickly...perfect for long travel trips. Underwear, shirts, pants.
I'd personally buy a smaller pack (and I'd size it to be able to take it on a plane) first, then MAKE my load fit it and adjust the load accordingly.
Kids I see walking around with these huge packs, bigger than they are, look miserable...
-Brian in SLC