What Size Suitcase Do You Actually Need? A Guide by Trip Length
Choose a suitcase that's too small and you'll be sitting on the lid the night before you fly. Choose one that's too big and you'll pay to haul half-empty luggage across three airports. The right size depends less on where you're going and more on how long you'll be away, and this guide matches the two up for you.
At Aerolite, we make cabin, medium and large suitcases for every kind of trip, from a Friday-night city break to a month-long family holiday. Here's our honest, no-fuss guide to choosing the right size for your trip length, with real dimensions, real capacities and the packing tips that make every litre count.
01 - Why Suitcase Size Matters More Than You Think
Most people pick a suitcase by eye in a shop or by the biggest number on a product page. But size affects more than how much you can pack. It decides what you pay at the airport, how easy your journey is, and whether you spend the holiday living out of a jumble or an organised case.
Too Small
You're squashing, sitting on the lid and leaving essentials at home. Overstuffed cases also strain zips and hinges, which shortens their life.
Too Big
A big case is heavier before you've packed a thing. It's harder to manage on trains and stairs, and it's easy to overfill and go over your airline's weight limit.
Just Right
Everything fits, nothing rattles, and you stay under the weight limit with room left for souvenirs. That's what this guide is for.
02 - The Aerolite Suitcase Size Guide
Here's how the three main suitcase sizes compare. The figures below are taken from Aerolite's best-selling Premium PP range, so they're real measurements, not vague ranges.
| Size | Dimensions | Capacity | Weight | Best For |
|---|---|---|---|---|
| Cabin (21") | 55×40×20 cm (expands to 55×40×23 cm) |
39.6L – 45.5L | 2.6kg | Weekend breaks up to about a week |
| Medium (24") | 66×44×26 cm | 67L | 3.31kg | Around 5–10 days |
| Large (28") | 76×49×30 cm | 100.8L | 4.18kg | Two weeks or more, long-haul and families |
03 - Choosing by Trip Length
Now for the useful part. Find your trip below and you'll know which size to pick.
Weekend & City Breaks
- A cabin suitcase is all you need
- No checked bag fees, no carousel queue
- Room for 2–3 outfits, toiletries and a spare pair of shoes
- Easy to wheel over cobbles and up hotel stairs
The Classic Week Away
- An expandable cabin case works if you pack light
- Move up to a medium for beach kit, nights out or colder weather
- Expanding to 45.5L gives you room for the trip home
- Couples can share one medium case and a cabin bag each
The Two-Week Holiday
- A medium suitcase is the sweet spot for one person
- A large suitcase suits two people sharing
- Pack for 7 days and plan one laundry stop
- Bring a cabin case for valuables, tech and a change of clothes
Extended & Long-Haul Trips
- A large suitcase gives you over 100 litres of space
- Ideal for multiple climates, family trips and visiting relatives
- Watch the weight, because big cases fill up fast
- Pair with a cabin case so the essentials stay with you
04 - What Actually Fits in Each Size?
Litres are hard to picture, so here's what a sensibly packed Aerolite suitcase of each size will typically hold for one adult in warm weather.
🧳 What Fits: A Rough Guide
05 - Packing Tips to Make Every Litre Count
The right size helps, but how you pack matters just as much. These habits can win you back a surprising amount of space, whatever case you're using.
Roll, Don't Fold
Rolling T-shirts, jeans and casual wear saves space and cuts down on creases. Fold only structured items like blazers and shirts.
Use Packing Cubes
Cubes compress your clothes and keep each category in its own place. They also make living out of a case on a two-week trip far easier.
Build a Capsule Wardrobe
Choose clothes in two or three colours that all work together. Five tops and three bottoms give you fifteen outfits without a bigger case.
Wear Your Bulkiest Items
Travel in your heaviest shoes, your thickest jumper and your jacket. It frees up space and keeps your bag under the weight limit.
Heavy Items at the Wheel End
Pack shoes and heavier items near the wheels so the case stays balanced and rolls easily. Stuff socks inside shoes to use the dead space.
Weigh Before You Leave
A quick check with a luggage scale at home is much cheaper than an excess baggage fee at the desk. Leave a few kilos spare for the journey home.
06 - Aerolite Suitcases for Every Trip Length
Every case in our Premium PP range has a tough, lightweight polypropylene hard shell, four 360° dual spinner wheels, a TSA-approved combination lock and an organised interior. Choose a single size for your next trip, or get all three in one go.
Aerolite Premium PP Expandable Cabin Suitcase - Weekends to a Week
55×40×20 cm for Ryanair Priority, TUI and Vueling, expanding to 55×40×23 cm for Wizz Air Priority, Lufthansa, Eurowings and Turkish Airlines. Holds up to 45.5L, weighs just 2.6kg, and has a TSA lock, packing straps, a zipped divider and a waterproof toiletries pocket. The one bag for every short trip.
Aerolite 24" Medium Suitcase - 67L for a Week or More
The all-rounder for a week in the sun or a fortnight with a laundry stop. 66×44×26 cm, 67L of space, only 3.31kg, with packing straps, mesh pockets, a zipped divider and a waterproof section for damp swimwear. Light enough to leave plenty of your checked bag allowance for your holiday wardrobe.
Aerolite 28" Large Suitcase - 100.8L for Extended Trips
Built for long-haul holidays, family trips and anything over two weeks. 76×49×30 cm, a huge 100.8L capacity, and just 4.18kg empty. Inside, packing straps, a zipped divider, mesh compartments and a waterproof pocket keep things tidy. The hard shell is made using recycled ocean plastic.
Can't decide? Get the set. If you take a mix of trips across the year, such as city breaks in spring, a fortnight in the sun in summer and family visits at Christmas, the Aerolite Premium PP 3-Piece Luggage Set covers every trip length in one purchase. You get the expandable 21" cabin case, the 24" medium and the 28" large, all in a matching finish.
Cabin
55×40×20 cm, expanding to 55×40×23 cm. 39.6L–45.5L, 2.6kg. For weekends and short breaks.
Medium
66×44×26 cm, 67L, 3.31kg. For a week to ten days away.
Large
76×49×30 cm, 100.8L, 4.18kg. For two weeks or more and family holidays.
Found your perfect size?
Shop the Aerolite 3-piece set and you're covered from weekend breaks to month-long adventures, with free Mainland UK delivery.
Frequently Asked Questions
Common questions about choosing the right suitcase size, answered.
What size suitcase do I need for a week?
For a week away, most travellers are best suited to a medium suitcase of around 65–70 litres, such as the Aerolite 24" Medium Suitcase at 67L. If you pack light and want to avoid checked bag fees, an expandable cabin suitcase measuring 55×40×20 cm, expanding to 55×40×23 cm and holding up to 45.5L, can also manage a week with a capsule wardrobe and packing cubes.
What size suitcase do I need for two weeks?
For two weeks, one person will usually find a medium suitcase of around 67 litres enough, especially with a planned laundry stop halfway through. If two people are sharing one case, or the trip involves bulky clothing or several climates, a large suitcase of around 100 litres, such as the Aerolite 28" Large Suitcase at 100.8L, is the better choice.
Can I travel for a week with just a cabin bag?
Yes, many travellers manage a week with just a cabin bag, particularly for warm-weather trips. The key is a capsule wardrobe of mix-and-match clothes, packing cubes to compress everything, wearing your bulkiest items on the plane, and keeping toiletries to travel sizes. An expandable 55×40×20 cm cabin suitcase that expands to 55×40×23 cm gives you up to 45.5L of space and fits the cabin allowances of airlines including Ryanair Priority, Wizz Air Priority and Lufthansa. Always check your airline's allowance before you fly.
What are the dimensions of a medium suitcase?
A medium suitcase is typically around 24 inches tall, with dimensions in the region of 65–68 cm × 42–45 cm × 25–28 cm. The Aerolite 24" Medium Suitcase measures 66×44×26 cm, holds 67 litres and weighs 3.31kg. Medium suitcases are check-in luggage and travel in the aircraft hold.
Is a 28 inch suitcase too big?
A 28 inch suitcase is ideal for trips of two weeks or more, family holidays and long-haul travel, but it can be more than you need for shorter trips. The Aerolite 28" Large Suitcase measures 76×49×30 cm, a total of 155 cm, which sits within the 158 cm total that most airlines allow for checked baggage. Because large cases fill up quickly, weigh your bag before travelling to make sure it stays within your airline's weight limit, which is usually 20–23kg.
How much does a suitcase weigh when empty?
Empty suitcase weights vary by size and material. Lightweight polypropylene hard shell cases are among the lightest options. In Aerolite's Premium PP range, the cabin suitcase weighs 2.6kg, the 24" medium weighs 3.31kg and the 28" large weighs 4.18kg. A lighter case leaves more of your baggage allowance for what you actually want to pack.
Is it worth buying a luggage set?
A luggage set is worth it if you travel for a mix of trip lengths throughout the year. A 3-piece set gives you a cabin case for weekend breaks, a medium case for week-long holidays and a large case for extended or family trips, all in one matching purchase. The Aerolite Premium PP 3-Piece Luggage Set includes an expandable 21" cabin case, a 24" medium and a 28" large, all with TSA locks and 360° spinner wheels.
Should I choose a hard shell or soft shell suitcase?
For most trips, a hard shell suitcase offers better protection for your belongings, is more resistant to rain and scuffs, wipes clean easily and is harder to tamper with. Polypropylene hard shells, like those in Aerolite's Premium PP range, combine that protection with a light weight. Soft shell cases can offer external pockets and a little more give when squeezing into tight spaces, but hard shells are generally the better choice for checked luggage.
