Personally speaking from experiance with 3 kids on the move, carry on.... let kids pack as many toys as possible in that bag, take copies of all legal id documents Take cothes not lots but enough to wash dry and wear. Nappies yes, can u pack in kids suitcase as there clothes dont take up so much room and small toiletries. any other things buy second hand or new over there to see ya through. thats what we did. Take light weight stroller and sling.

with a 1 year old thats baby weight right?????? well with virgin it is and free

good luck