What Size Luggage Should I Buy? How to Find the Right Fit for You
Quick Answer
Working out what size luggage to buy comes down to trip length and how you fly. A carry-on around 55 x 40 x 20 cm (roughly 22 x 14 x 9 inches in the US) covers weekends and short work trips, a medium 24 to 26 inch checked case suits one to two weeks, and a large 28 to 30 inch case is for longer trips or families sharing. Most travellers do best with a carry-on plus one medium checked case.
Key Takeaways
- Airline size limits include wheels and handles, so check the outside dimensions, not just the packing space.
- Many airlines limit checked bags to 158 cm (62 inches) when you add length, width and height together.
- Standard economy checked bags are often limited to 23 kg, and big cases hit that weight before they're full.
- Expandable zips add space but can push a carry-on over cabin limits.
- Budget airlines often allow only a small under-seat bag for free.
What Size Luggage for Each Trip
The table below matches common luggage sizes to trip lengths. Sizes vary slightly between makers, and airline rules differ, so always check your airline before you fly.
| Size | Typical dimensions | Trip length | Notes |
|---|---|---|---|
| Personal item or underseat bag | About 40 x 30 x 15 cm | Day trips, budget flights | Fits under the seat in front |
| Carry-on (cabin) | About 55 x 40 x 20 to 23 cm (20 to 22 inch) | 2 to 5 days | Avoids checked bag fees and waiting |
| Medium checked | 24 to 26 inch | 1 to 2 weeks | Easy to keep under weight limits |
| Large checked | 28 to 30 inch | 2 weeks or more, families | Can go overweight quickly |
| Luggage set (3 pieces) | Usually 20, 24 and 28 inch | Mix and match | Nests together for storage |
How to Choose the Right Fit for You
Picking what size luggage suits you is easier if you work through these questions in order.
- Think about your usual trip length, not your longest one.
- Check the cabin and checked bag rules for the airlines you use most.
- Decide whether you'd rather pack light in a carry-on or check a bag.
- Consider who's travelling, since families can share one large case.
- Weigh the empty case, as lighter shells leave more of your allowance for clothes.
For more detail on measurements, our luggage size guide covers standard sizes in depth, and our carry-on luggage comparison guide helps you choose a cabin case. If you're still deciding on materials, our guide on hardside and softside luggage explains the trade-offs.
Features Worth Checking
Once you know what size luggage you need, these details decide how pleasant it is to use.
- Four spinner wheels for easy rolling through airports.
- TSA-approved locks if you travel to or through the US.
- A compression strap or divider to keep clothes in place.
- A front pocket or laptop sleeve on carry-ons for quick access.
- Sturdy telescopic handles that don't wobble at full height.
What to Expect at Each Price
| Price (USD) | What you usually get | Who it suits |
|---|---|---|
| Under $50 | Travel backpacks, basic softside carry-ons | Light packers, budget flights |
| $50 to $150 | Hardside carry-ons, 3-piece sets, spinner wheels, TSA locks | Most holidaymakers |
| $150 to $350 | Lighter shells, better wheels, aluminium frames | Frequent flyers |
| $350 and up | Premium aluminium or polycarbonate, long warranties | Business travellers and heavy use |
A 3-piece set in the $50 to $150 range is often the best value, because it answers the what size luggage question for every kind of trip at once.
Safety and Travel Tips
Lift heavy cases with your knees bent and get help with overhead lockers rather than straining your back. Keep power banks and spare lithium batteries in your cabin bag, as most airlines don't allow them in the hold. Weigh your case at home with a luggage scale to avoid fees, and keep medicines, documents and valuables in your carry-on in case checked luggage is delayed.
Our Picks From the Global Swanky Store
These cover the main sizes, from a travel backpack to a full luggage set.
The Luggage Sets 3 Piece Trolley Suitcase with TSA Lock,20 Inch 24 Inch 28 Inch Traveling Storage Luggage Sets with Spinner Wheels is $109.32, for families and anyone who travels in different ways.
A carry-on, medium and large case in one set covers every trip length, and it's the one I'd recommend for most homes.
The 3 Piece Spinner Suitcase Hardshell Lightweight with TSA Lock Luggage Set for Travel, Business Trip, Sky Blue is $96.57, suited to travellers who want a lighter hardshell set.
Lightweight shells leave more of your weight allowance for packing.
The Carry on Suitcases Hardside Luggage with Spinner Wheels TSA Lock Lightweight for Travel is $113.59, for short trips with cabin baggage only.
Check its dimensions against your airline's cabin limits before you book.
The Trunk Carry-on Suitcase 20 Inch Aluminium Luggage Travel Bag Permitted to Both Men and Women Front Opening Durable is $136.29, made for frequent flyers who want quick access.
A front opening lets you grab a laptop or jacket without opening the whole case on the floor.
The Carry-On Travel Backpack for 17-Inch Laptop and Business Trips is $29.78, for budget flights and short business trips.
A backpack can count as a personal item on many airlines, and it fits a large laptop too.
Frequently Asked Questions
Is a 22 inch suitcase allowed as carry-on?
Often in the US, but many international and budget airlines cap cabin bags at around 55 cm, so check first.
What size suitcase do I need for 2 weeks?
A 24 to 26 inch medium case usually works, especially if you can do laundry on the way.
Do wheels count in luggage dimensions?
Yes, airlines measure the full outside size including wheels and handles.
Is it better to have one large case or two medium ones?
Two medium cases are easier to keep under weight limits and to lift.
How much does an empty suitcase weigh?
Typically around 2 to 3.5 kg for a carry-on and 3.5 to 5.5 kg for a large case.
Our Recommendation
If you're unsure what size luggage to get, start with a carry-on around 55 cm plus a 24 to 26 inch checked case, which covers short breaks and two-week holidays. A 3-piece set is the most flexible option for families or anyone who travels in different ways.