Thank you all so much for your help. I hadn't come across those web sites before. Loved the Ship to Shore site - seems to answer a few of our problems! We are so excited about the whole trip which takes in the Galapagos, Amazon, Christmas with our daughter in Quito, 28 days tour of Peru, Argentia etc before the Antartica, then on to London to our son before returning to Australia - 10 weeks in total - but keep the luggage to 23 kgs??? and cover every eventuallity. So thank you all for your valuable advice for this part of our trip.