best speakers for travelling

[Malcolm Hamilton]

Hello everyone -
Aplogies if this has been covered already!
I travel with my Ti, and want to bring along some external speakers.
I've checked out the tiny compact units that are designed for this 
very purpose (the Sony model folds flat, for example), but the sound 
quality is pretty bad.
If I'm willing to make a little more room in my luggage, what speaker 
system would be good, without being too bulky or breakable?
Any suggestions?
Thank you,
Malcolm