In reply to Lord of Starkness:
It's hardly "budget" but don't be fooled into buying a DHB hard case from Wiggle - you have to remove so much stuff from your bike to fit it in you spend half your holiday putting it back together.
I have an EVOC one which is fine, but toying with splashing out on the Biknd Helium as that looks a great combination of weight, storability and protection, as well as being really easy to pack.