I am soon to embark on my first ever flight on Tiger, return MEL-OOL with the family mid September. We have booked carry-on baggage only tickets, which allows 7kg per person. However, I can't find anywhere what the dimension limitations are for the bags. Is any (reasonable) size ok, as long as it is under 7 kg? Also, are you allowed to pool the allowance for 2 pax, and so take a 14kg bag?