The difference between the two lies in their size and cabin placement. Under-seat bags, designed to fit beneath the seat in front of you, typically measure approximately 16 x 12 x 8 inches - enough room for essentials and perhaps a souvenir or two. In contrast, their larger carry-on counterparts are stowed in the overhead compartment, with standard dimensions of about 22 x 14 x 9 inches - ready to carry your wardrobe choices and more.

Though it varies by airline, the most common/standard under-seat bag size is 16 x 12 x 8 inches. They are worth it if you want to travel light and save on baggage fees, avoid the carousel, and have a hassle-free travel experience. And the secret to it all? A quality backpack that can tick these boxes.

Knowing to pick the perfect personal item is one thing, how you pack and use it on the road is another. Here are some savvy traveller’s hacks to make the most out of your underseat bags:

• Double-Check size restrictions: Some carriers have detailed restrictions on what size your personal item should be, while others only state that it should be small enough to fit the designated space. Always check the specific dimensions allowed by your chosen airline to avoid any surprises at the gate.
• Weigh before you fly: Avoid baggage fees by checking your underseat bag's weight before reaching the airport. Most airlines allow around 7-10 kg (15-22 lbs) for carry-on luggage.
• Be a minimalist: Embrace the "pack light" mentality. Opt for versatile clothing you can mix and match. Consider wearing your bulkiest clothes on the plane.
• Packing cubes are your friend:  Invest in packing cubes to categorise your belongings by type (clothes, toiletries, etc.) and maximise space efficiency.
• Roll your clothes: Rolling clothes creates a space-saving tight fit and minimises wrinkles.
• Use Every Nook and Cranny: Underseat bags often have pockets. Use them for essentials you need quick access to during the flight.
• Think small toiletries: Purchase travel-sized toiletries or decant your favourites into smaller containers. Check TSA and FAA guidelines for liquid restrictions before packing.