One more sleep

We leave tomorrow at 9 am.  I'm mentally worn out from packing - we have to take clothes for the freezing cold in Antarctica, and clothes for the heat in Buenos Aires. Qantas allow 2 pieces of luggage of 23 kg each!  That's the good news; the bad news is that Viva Expeditions only allow one medium suitcase plus a day backpack on the 25-day overland leg from Ushuaia to Santiago.  So packing has been a case of "what can I leave out?".   And what about space for souvenirs?