What Size Suitcase Do I Need? — The UK Traveller's Guide

What size suitcase do you need for a trip from the UK? The answer depends on what you plan to pack, how long you are away, how you will move the bag and the baggage allowance attached to your booking. An inch-size label is a shopping description, not an airline size approval.

Start with your booking

Before choosing or packing luggage, check your booking confirmation and the airline's latest baggage guidance. Confirm which cabin or checked bags are included or must be added, their full external size and packed-weight limits, and any different rules on connecting flights. Measure the case including wheels and handles, and weigh it when packed.

Checked-baggage limits vary by airline, fare and route. Do not assume every airline includes a checked bag or that every checked bag has a 23kg limit. A case's capacity also does not increase the weight allowance you have purchased.

What size suitcase do I need for a week away?

For a week away, a medium suitcase, often labelled 24-inch, is worth considering if you have a suitable checked-bag allowance and want room for clothing, toiletries and additional shoes. A cabin bag may be enough if you pack lightly, take fewer shoes and can rewear or wash clothes. There is no single size that suits every seven-day trip: choose around your packing list and booked allowance rather than the number of days alone.

• A week in warm weather: a cabin bag may work for a compact packing list with lightweight clothes, provided its full dimensions and packed weight meet your booked cabin entitlement. A free under-seat allowance is not the same as a larger overhead-bag allowance.
• A week with extra outfits or shoes: consider a medium checked case when you need more room and your booking permits it. Compare the actual dimensions, capacity and empty weight of individual cases, not just their inch-size labels.
• A week in cold weather: bulky layers and additional footwear can require more packing space. Lay out what you intend to take before deciding whether a medium case is sufficient or a larger checked case is needed.
• A week with laundry access: washing and rewearing clothes may let you take a smaller bag. Plan around what you will actually use rather than packing a separate outfit for every possible occasion.

Before buying, lay out your clothes, toiletries, shoes and other essentials. Choose a case that accommodates that list, remains manageable for your journey and meets your booking's full size and weight limits. Extra capacity is not permission to exceed the weight allowance; weigh the packed bag before travelling. Check the size categories below to compare your options.

Understanding common suitcase sizes

• Small or cabin-labelled cases: may suit short breaks, but check the actual external dimensions. A case that fits an overhead-bag limit may be too large for a free under-seat allowance.
• Medium cases, often labelled 24-inch: offer space for a longer trip when you have a suitable checked-bag entitlement.
• Large cases, often labelled 28-inch: provide more volume but may be awkward to carry and easy to pack beyond a weight limit.
• Luggage sets: give you several case sizes for different journeys, but are not automatically cheaper or necessary if you mainly use one size.

Short break or weekend away

If you pack light, a small case or bag may be enough. First check whether your booking includes an overhead bag, only a smaller under-seat item, or both. A 20-inch case is not automatically a free cabin bag. Compare the options in our cabin-size luggage selection with your own booking.

One or two weeks away

A medium case can be worth considering if you have a checked-bag allowance and want room for clothing and shoes. A 24-inch label does not tell you its packed weight or whether it meets every airline's size limit. Browse our hardshell cases and check each live product listing for dimensions, weight, features and availability.

Longer trips or family travel

A large case can be useful when you need more space, but think about stairs, transfers and how much you can comfortably lift. If travelling as a family, compare a set with individual cases and the allowance for each traveller. Check whether any weight-pooling rules apply to your particular booking rather than assuming bags can share weight. See our luggage sets for current options.

Hardshell or softshell?

Hardshell cases have a structured exterior; softshell cases may offer different pockets and flexibility. Neither type guarantees better protection for every item or trip. Compare the particular case's construction, weight and layout. Our hardshell versus softshell guide discusses those trade-offs.

Choose for the whole journey

Pick a bag that suits your actual booking and what you can manage when it is full. Browse the current catalogue for available options, and check each listing for price, dimensions and stock.

Travel Smarter with Neil's Luggage Store.