Can anyone please advise? I need new suitcases and have thrown all our old ones away, so I can't compare sizes. I went into John Lewis and had a look but couldn't decide what was "normal" size for check-in luggage. Some of it was enormous! But I'm worried about buying something too small (I kept our cabin-sized cases, so no probs there). In a nutshell, do I need an 80cm tall suitcase per person for 10 days in the Carribean? Or would a 69cm one do? I don't want one so huge that I fill it too full and end up paying extra to check it in!
Thanks for your advice. 
Smarty xx