Wondered if anyone can suggest how best to pack car seats. We are taking 2 dc to Canada this summer and are taking our own high back boosters for both of them, as hiring boosters costs $10 a day each with hire car and cannot be guaranteed at the other end. Air Canada say they carry car seats but not how we should pack them. A large suitcase? 2 smaller suitcases? wrapped in bubble wrap and in a plastic sack? All suggestions and experience welcome, thank you!