Catriona Rowntree, a seasoned travel journalist known for her work on Getaway, has shared her six essential items for carry-on bags during long-haul flights. After 30 years of experience, she emphasizes the importance of staying hydrated and avoiding jet lag. One of her key tips includes drinking electrolytes before, during, and after flights to help mitigate jet lag effects. Additionally, she suggests carrying a moisturizing spray to keep skin hydrated throughout the journey. Hygiene is also a priority for Rowntree, who recommends antibacterial wipes for cleaning surfaces and removing stains. She advises travelers to bring their own pen for filling out immigration cards, as they can be hard to find onboard. A nail file is another must-have, helping to alleviate discomfort from broken nails during long flights. Lastly, she highlights the benefit of using a brightly colored passport cover to easily spot the passport in a bag. Rowntree's video showcasing these tips has garnered over 220,000 views, sparking conversations about travel essentials.