Dear Lifehacker, I'm from the US and will be visiting Australia in November for business. I have 4 domestic flights on Virgin Australia and I plan to travel light (backpack + 1 personal item). I've spent lots of time trying to find a carry-on bag that meets VA's size guidelines. The bag I'm looking at is slightly over their size requirements. So I'm wondering: how strictly do they enforce them? Should I try my luck or look for a smaller bag?