Choosing the right suitcase size can be more challenging than it seems. Go too small and you’ll be cramming clothes into every corner. Go too big and you risk paying oversized baggage fees.
This quick guide breaks down the four main suitcase sizes — carry-on (S), medium (M), large (L), and extra-large (XL). I’ll also explain the 158 cm rule that most airlines use, so you don’t get caught off guard at the airport.
Suitcase sizes aren’t fully standardised, so I looked at the most common models to work out average dimensions. These figures are a guide only and may vary slightly between brands.
| Size | Duration | Capacity | Dimensions |
|---|---|---|---|
| S (Carry-On) | 2–3 days (up to 5 if you pack light) | 35–40 L | 50–55 cm / 19–22 in |
| M (Medium) | Around 1 week | 50–80 L | 65–70 cm / 25–27 in |
| L (Large) | 2 weeks (or more, if you're organised) | 80–100 L | 75–79 cm / 29–31 in |
| XL (Extra-Large) | 2–3 weeks, relocations, long stays | 120–140 L | 80–85 cm / 32–34 in |
The right suitcase size really depends on your trip and how you like to pack. For example, a medium (M) case usually works fine for a week at the beach. But if you’re heading on a ski trip for the same amount of time, you’ll probably need a large (L) to fit the bulkier gear.
It also comes down to your style of travel—are you a light packer who keeps things simple, or do you like a little extra room for comfort and flexibility?
Suitcase Sizes Explained: From Cabin Bags to Extra-Large
Suitcase Size S – Ideal for Short Trips
A size S suitcase is perfect for quick getaways, usually up to 3 days. Personally, I find it works even for a 4–5 day summer trip if I pack light and bring a backpack for extra space.
Most airlines accept this size as carry-on luggage, which is why it’s also called hand luggage. Just keep in mind that the exact limits can differ depending on the airline, but the common dimensions are around 55 × 40 × 20 cm.
It’s compact, easy to handle, and saves you from waiting at baggage claim — which makes it a favorite for many frequent travelers.
Suitcase Size M – Best for a Week Away
Medium suitcases are the all-rounders. With around 50–80 litres of space, they’re spot on for a one-week holiday. If you’re a light packer, you can even push it to two weeks.
I find this size works best for solo travellers and couples. It’s roomy enough without being too heavy, and it’s typically within airline weight limits when fully loaded.
Suitable for: One-week trips, couples, and city breaks.
Suitcase Size L – Perfect for Two-Week Holidays
A large suitcase provides around 80–100 litres of space, making it ideal for two-week trips or family holidays. You’ll have room for extra outfits, shoes, or bulkier winter gear.
The downside? It’s easy to overpack. A fully loaded large suitcase can exceed the 23 kg / 50 lb limit that airlines often set.
Good for: Long trips, family packing, winter holidays.
Suitcase Size XL – For Long Stays & Relocations
Extra-large cases can hold a massive 120–140 litres. They’re tempting for long trips, but here’s the catch: most airlines classify them as oversized luggage if they exceed the 158 cm rule (explained below). That means extra fees.
I only recommend XL if you’re not flying — for example, if you’re relocating, going on a road trip, or need storage for an extended stay.
Suitable for: Relocations, road trips, long-term travel
Understanding the 158 cm Checked Baggage Rule
What the 62-Inch Luggage Limit Really Means
Most airlines use the 158 cm (62 in) rule for checked luggage. This means that the total height, width, and depth of your suitcase (including wheels and handles) must not exceed 158 cm in length.
Example:
- Size L (75 × 51 × 28 cm) = 154 cm ✅ allowed.
- Size XL (81 × 54 × 30 cm) = 165 cm. ❌ may be classed as oversized.
Tip: Always measure with wheels and handles in place. It’s a common mistake — and one that can cost you extra at the airport.
How to Measure Your Suitcase Properly
Imagine you’re eyeing up the American Tourister Soundbox and can’t decide whether to go for the large (L) or extra-large (XL). To see which one stays within the 158 cm rule, let’s compare the dimensions.
- Size L (75 cm): 75 × 51 × 28 cm → 154 cm total (about 61 in) ✅ Within the 158 cm limit.
- Size XL (81 cm): 81 × 54 × 30 cm → 165 cm total (about 65 in) ❌ Over the limit and may count as oversized.
👉 What does this mean? The large size (L) is airline-friendly and safe for checked luggage. The extra-large (XL), however, goes beyond the 62-inch rule, so you could be hit with extra charges if you’re flying.
⚠️ Quick tip: Always measure your suitcase, including the wheels and handles. Airlines do, and that extra few centimeters can make all the difference at check-in.
And don’t forget the wheels! Learn whether two or four wheels are best for you in my post on 4-Wheel vs 2-Wheel Suitcases: Find the Best Fit.
Final Thoughts
If you’re still unsure, go with a medium suitcase (M). It’s the most versatile size, works for most week-long holidays, and is far less likely to tip into oversized or overweight territory.
That said, the right suitcase is really about your travel style. If you love to pack light, a carry-on will serve you well. If you’re heading abroad for two weeks with kids, a large suitcase might be worth the extra effort.
For lightweight options, check out my guide on the Best Lightweight Suitcases in the UK (2025).
Choose smartly, pack wisely, and you’ll travel lighter — both in weight and in stress.
Suitcase Size FAQs – Answers to Common Travel Questions
How big is a 23 kg suitcase? And how can you measure it?
A suitcase that holds 23 kg (50 lbs) is usually classed as a large (L) size. This weight is the standard checked baggage allowance on many airlines, and large suitcases are built to carry plenty without being oversized.
What's the best way to pack a suitcase for a week-long trip?
For a week-long trip, a medium (M) suitcase is the versatile choice. With a capacity of 50–80 litres, it’s perfect for your outfits, toiletries, and shoes, striking the right balance between spaciousness and manageability.
How do you choose the right suitcase for your trip?
With a bit of strategic packing, a medium (M) suitcase can stretch to a two-week trip. However, for most travellers, a large (L) suitcase is the more flexible option, offering 80–100 litres of space for extra clothes, shoes, or bulkier items like coats.
Is a carry-on enough for a two-week trip?
While a carry-on (S) is perfect for shorter trips of 3–5 days, it’s not usually sufficient for a two-week trip. Unless you plan to do laundry on the go, a checked suitcase is likely to be necessary.
Which suitcase sizes count as checked baggage?
Anything bigger than a carry-on is usually classed as checked luggage. This includes medium (M), large (L), and extra-large (XL) suitcases. Airlines may vary slightly, so it’s always worth checking their rules.
How big is a carry-on suitcase?
Most carry-ons (S) measure 50–55 cm tall (19–22 in) and hold around 35–40 litres. They’re designed to fit overhead bins, but remember—airlines measure including wheels and handles.
Is a 24-inch suitcase too big for carry-on?
Yes. A 24-inch case is usually too tall for carry-on allowance. Most airlines limit carry-ons to about 22 inches (55 cm) in height. At 24 inches, your case would count as a medium checked bag.
What's the usual weight limit for checked luggage?
Most airlines set the checked bag limit at 23 kg (50 lbs). Some, especially long-haul carriers, may allow up to 32 kg (70 lbs). Always double-check with your airline before packing.
How much does a suitcase weigh
The weight of a suitcase depends on its size, material, and brand. On average:
Cabin/Carry-on (55 cm / 20 in): 2–3 kg (4–7 lbs)
Medium Checked (65–70 cm / 25–27 in): 3–4.5 kg (7–10 lbs)
Large Checked (75–80 cm / 28–31 in): 4.5–6 kg (10–13 lbs)
Extra-Large (over 80 cm / 32 in+): 5–7+ kg (11–15 lbs)
👉 Lightweight suitcases (like Samsonite Lite-Shock or Rimowa Essential Lite) are designed to save you a kilo or two, which makes a big difference if your airline has strict baggage limits.
⚠️ Tip: Always check your airline’s weight allowance — most economy checked bags allow 20–23 kg (44–50 lbs), including the suitcase itself.
What are the dimensions of a medium-sized suitcase?
A medium suitcase is the sweet spot between a compact carry-on and a big checked bag. It’s perfect for trips of about a week.
Most medium suitcases measure about 65–70 cm (25–27 inches) in height. When you add the width and depth, the overall dimensions usually fall around:
Height: 65–70 cm (25–27 in)
Width: 40–45 cm (16–18 in)
Depth: 25–28 cm (10–11 in)
In terms of capacity, that works out to roughly 60–75 litres — enough space for a week’s worth of clothes, shoes, and a few extras without being too bulky to handle.
