We took my them 4 month old away and just packed our electric steriliser.
What about the medela steam bags? I'm not sure if they would be big enough or if they're too expensive or if you can reuse them?
I still steralise his stuff now at 13.5 months... but if we went away i wouldn't bother just wash in hot soapy water. Rinse off in cold. Float in hot water (with kettle boiled water added too)