Medium vs Large Suitcase: Which Size Is Right for You?
Most luggage confusion comes down to one decision: medium or large? The difference between a 24" and a 28" suitcase sounds small on paper, but translates to 33 extra litres of packing space — roughly an entire extra outfit per day for a week, a pair of bulky shoes, or a week's worth of toiletries. This guide cuts through the noise and gives you a clear answer based on how you actually travel.
Both sizes are checked hold luggage — neither fits in an overhead locker. The question is purely about how much space you need for the journey ahead, and how much of your weight allowance you're comfortable giving to the empty bag itself.
The Numbers at a Glance
Before we get into the practical detail, here are the exact specifications for both Aerolite PP suitcases side by side. Every number below is taken directly from the product pages — not estimated.
Aerolite Medium PP Suitcase
Aerolite Large PP Suitcase
The key difference: 33.8 extra litres, 87kg more empty weight, and an extra 10cm in height and 4cm in depth. Those numbers are real — and they matter differently depending on how you use the bag.
Trip Length: The Simplest Starting Point
The most reliable way to match a suitcase size to your needs is trip length. Here's a straightforward guide based on what most travellers actually pack:
| Trip Length | Typical Packing Volume | Recommended Size | Why |
|---|---|---|---|
| 1–3 days | 15–25L | Cabin bag | A checked suitcase of either size is unnecessary for this length |
| 3–5 days | 25–46L | Cabin 21" | 45L gives ample room for 3–5 outfits, shoes, and toiletries with space to spare |
| 5–7 days | 45–67L | Medium 24" | A week's casual packing fits comfortably in 67L for most travellers |
| 7–10 days | 60–85L | Either — depends on your packing style | Light packers fit in the medium; those packing a full outfit per day should go large |
| 10–14 days | 75–100L | Large 28" | Two weeks of clothing, shoes, and toiletries fills a large case comfortably |
| 14+ days | 100L+ | Xtra-Large 32" | Anything over two weeks requires the full 100L — and room for purchases on the way home |
Weight Allowance: Where Size Becomes a Real Decision
Both the medium and large suitcases weigh more when empty than a typical lightweight soft-shell case, but polypropylene keeps that figure as low as possible for a hard-shell bag. Here's what the weight difference means in practice on a 23kg checked allowance — the standard for most Economy fares on UK airlines.
| Medium 24" (67L) | Large 28" (100.8L) | |
|---|---|---|
| Bag empty weight | 3.31 kg | 4.18 kg |
| Remaining allowance at 23kg | 19.69 kg for contents | 18.82 kg for contents |
| Usable weight advantage | +0.87 kg extra packing capacity | — |
| Volume-to-weight ratio | 20.2L per kg of bag weight | 24.1L per kg of bag weight More efficient |
The medium bag gives you slightly more of your 23kg allowance for actual packing, but the large bag is more volume-efficient — you get more litres per kilogram of bag weight. This is relevant if you regularly pack to the weight limit: the large gives you more space per kilo spent on the bag.
When the Medium Is the Smarter Choice
The 24" medium is not a compromise — it's the right tool for the job in a wide range of common travel scenarios. Here's when it genuinely outperforms the large.
Frequent Flyers & Business Travel
The lighter empty weight and smaller footprint mean faster check-in, easier handling on trains and taxis, and quicker unpacking and repacking between back-to-back trips. For 3–7 day business trips, the 67L medium is almost always sufficient — and significantly more manageable.
Short-Haul European Holidays
A week in the Canaries, a few days in Barcelona, or a city break in Rome — these trips don't need 100 litres. The medium gives you everything you need without dragging a bag that's half-empty through the airport.
Travellers with Tight Weight Limits
If your airline's checked allowance is tight (or you're paying per kilo), the medium's 3.31kg empty weight preserves nearly a full kilogram more for your actual packing vs the large. On a budget carrier with a 20kg limit, that 0.87kg difference can mean the difference between checking in cleanly or paying excess.
Light or Minimalist Packers
If your packing style runs lean — a few mix-and-match outfits, compact toiletries, one pair of shoes — you'll never fill a 100L large case for most trips. A 67L medium is the right fit: you use all the space without the bag becoming unwieldy.
When the Large Is the Right Call
The 28" large isn't about packing more for the sake of it. There are specific situations where the extra 33.8 litres earns its place — and trying to make the medium work instead causes real problems.
Holidays of 10 Days or More
Fourteen days of clothing, two pairs of shoes, full-size toiletries, and a few bulky items like a beach towel or light jacket will genuinely fill a 100L large case. Trying to compress this into 67L typically means leaving things behind or buying duplicates at your destination.
Family Travel
Families consolidating packing across fewer bags will always benefit from large cases. Children's clothing is compact, but bulky essentials — nappies, travel bottles, extra changes of clothes — eat through 67L quickly. One large case per adult is the practical minimum for most family holidays.
Cold-Weather or Ski Trips
Winter clothing is simply bulky. A single thick coat fills as much space as three summer outfits. Add thermals, heavy trousers, multiple jumpers, and winter boots, and a medium case becomes genuinely strained. The large gives you the breathing room winter packing demands.
Shopping Trips & Gift-Heavy Travel
If you travel to shop, or regularly return home loaded with gifts and purchases, the large suitcase is the sensible choice. Its 100.8L capacity means you can leave home with 70L packed and have 30L available for the return journey without paying excess baggage fees at the airport.
What They Share — Built the Same Way
Despite the size difference, the medium and large Aerolite PP suitcases are built from the same core specification. Both use polypropylene hard shells — the material of choice for premium checked luggage because it absorbs impact without cracking, resists scratches, and keeps the bag lighter than equivalent ABS alternatives.
Both include four dual 360° spinner wheels for effortless navigation through airports and stations. Both have a TSA-approved 3-digit combination lock built into the frame. Both include a smart organised interior: packing straps to keep clothes in place, a zipped mesh divider, and a waterproof pocket for toiletries or damp items. Both have an ergonomic telescopic handle that extends to 1 metre and locks at multiple heights. And both come with a 5-year Aerolite warranty — meaning the same construction quality, just scaled to different capacities.
Head-to-Head: Every Factor That Matters
| Factor | Medium 24" (67L) | Large 28" (100.8L) |
|---|---|---|
| Capacity | 67L | 100.8L +33.8L |
| Empty weight | 3.31 kg Lighter | 4.18 kg |
| Packing budget (23kg allowance) | Up to 19.69 kg contents More allowance | Up to 18.82 kg contents |
| Dimensions | 66 × 44 × 26cm | 76 × 49 × 30cm |
| Ideal trip length | 3–7 days | 7–14+ days |
| Best for | Business travel, solo trips, short holidays | Long holidays, families, winter travel |
| Manoeuvrability | Easier — lighter and smaller footprint More agile | Slightly more effort when full |
| Shell material | Polypropylene (PP) | Polypropylene (PP) |
| Wheels | 4 dual 360° spinners | 4 dual 360° spinners |
| Lock | TSA-approved combination | TSA-approved combination |
| Interior | Packing straps, mesh pockets, zipped divider, waterproof pocket | Packing straps, mesh pockets, zipped divider, waterproof pocket |
| Zippers | Japanese YKK® zippers | Japanese YKK® zippers |
| Warranty | 5 years | 5 years |
The Decision: Which Size Is Right for You?
If you're still on the fence, run through this checklist. It covers the scenarios that tip the decision most consistently.
Aerolite 24" Medium PP Check-In Suitcase
Lightweight polypropylene hard shell suitcase with 67 litres of space — perfectly sized for 5–7 day trips. Features 4 dual 360° spinner wheels, a TSA-approved combination lock, smart organised interior with packing straps, mesh pockets, zipped divider, and a waterproof pocket for toiletries. Retractable handle extends to 1 metre with multiple locking heights. Backed by a 5-year Aerolite warranty. Available in Cream and multiple other colours. Free UK delivery and a free large packing cube included.
Aerolite 28" Large PP Check-In Suitcase
Massive 100.8L polypropylene hard shell suitcase for long trips, family holidays, and extended travel. Premium PP construction for outstanding strength and scratch resistance. Equipped with 4 dual 360° spinner wheels, Japanese YKK® zippers, built-in TSA-approved 3-digit combination lock, and a fully organised interior with packing straps, zipped mesh divider, and a waterproof toiletries pocket. Height-adjustable telescopic handle with side and top carry handles for easy lifting. Backed by a 5-year Aerolite warranty. Free UK delivery and a free large packing cube included.
Not sure yet? See both side by side.
Browse the full Aerolite checked luggage range — medium, large, and beyond.
Frequently Asked Questions
Common questions about choosing between a medium and large suitcase.
What is the difference between a medium and large suitcase?
A medium suitcase (24") measures 66x44x26cm and holds 67 litres — ideal for 5–7 day trips. A large suitcase (28") measures 76x49x30cm and holds 100.8 litres — suited to trips of 7 days or more, family travel, or winter packing. The Aerolite 24" medium weighs 3.31kg empty; the 28" large weighs 4.18kg empty.
Is a medium or large suitcase better for a week's holiday?
For a 7-day holiday, either size can work depending on how you pack. Light packers will find the 67L medium comfortable for a week. If you pack a full outfit per day, include bulky shoes, and want room for items on the return journey, the 100.8L large is the more relaxed choice. A week's worth of content fills a medium tightly — the large gives comfortable breathing room.
What is the 23kg check-in allowance in litres?
23kg is a weight limit, not a volume limit. The Aerolite 24" medium (3.31kg empty) leaves 19.69kg for contents on a 23kg allowance. The 28" large (4.18kg empty) leaves 18.82kg for contents. Both cases have more volume than most travellers can fill within the weight limit — meaning volume is rarely the constraint; weight is.
Can I take a medium suitcase as hand luggage?
No — a 24" medium measures 66x44x26cm, which significantly exceeds the cabin bag limits of all major UK airlines (typically 55x40x20cm for overhead lockers). Both medium and large suitcases are checked hold luggage only. For hand luggage only travel, you need a purpose-built cabin bag at 55x40x20cm or smaller.
What is polypropylene (PP) and why does it matter in a suitcase?
Polypropylene (PP) is a lightweight, impact-resistant plastic used for premium hard shell suitcases. It is lighter than ABS and more flexible than polycarbonate, absorbing impacts without cracking and resisting scratches over years of use. Both Aerolite PP suitcases use this material — keeping empty weight low (3.31kg and 4.18kg) while offering robust hold-luggage protection.
Should I buy a medium or large suitcase for family travel?
For family travel, one large suitcase per adult is almost always the better choice. A 100.8L large handles one adult's full 7–14 day packing with room to spare for children's items. Two large cases are more practical than two mediums for families consolidating their packing into fewer bags.
Which suitcase is better for frequent travellers?
Frequent travellers typically benefit most from the medium 24". At 3.31kg empty, it is lighter and easier to handle on repeated trips, preserves more of the 23kg allowance for packing, and is more manoeuvrable through busy airports and train stations. The large is better reserved for longer holidays where its extra 33L of capacity is genuinely needed.
