While booking this deal with Norwegian Air, I had some concerns due to their strict baggage rules. The airline clearly states restrictions like the max size your bag can be and the allowed weight you can carry on for flights.
Many people will never check their luggage but it isn’t always possible when you’re traveling with kids.
The main benefits of bringing your bags as a carry-on are saving time by not having to wait for them when the plane lands, not having to pay to check them and knowing that they’ll definitely make it to the destination.
On one of my first trips to Europe I had the unfortunate problem of my bag not showing up with my flight. While my friend and I did receive our bags later that evening, it was an inconvenience to walk up the Eiffel Tower feeling dirty and in not so comfortable footwear.