Fixed that for you. While there is nothing wrong with shutting down your computer, it is perfectly fine to let it sleep. Neither Apple nor any other authority will recommend against it.when traveling, shut it down. I have been in IT for over 16 years and never is it not recommended to travel with a computer of any kind in sleep mode.
There is no need to shut the machine down, provided it is kept in a real case that does now allow it to pop open and wake up. I have used Apple notebooks for over a decade, and never shut them down, except for hardware upgrades, from the day that I get them through the day that I replace them. My laptops have slept peacefully in their bags for days at a time, through airport X-ray machines, under the seats of aircraft, beside me on the subway, under a berth on the train, and in the trunk of my car. That's how they're designed to work.
If we were to take that approach, we would have to recommend people leave their computers in their boxes and never take them out. Incautious and ignorant people will inevitably have problems. The solution is to educate them, instead of discouraging them.That's all well and good and I'm happy to hear that you have never had a problem. However, we've seen posts from folks who were not as careful or as knowledgeable as you
Travelling with a sleeping Mac has long been a recommended practice by Apple. So long as you are not mishandling your computer, it is perfectly safe; if you are mishandling your computer, it's not safe anyway.