I ordered a 43L skypak with a view to using it as hand luggage on the way there and checking it to come back. I've got a small shoulder bag to use as my other piece of hand luggage. I'll shove my small backpack in the skypak outbound, and depending on how much/what stuff I buy, possibly use the Skypak and the BP as homeward bound luggage, neither checked in.

thanks for all your advice guys