A guide to choosing the right suitcase size! Capacity guidelines based on the number of nights you'll be traveling (2025 edition)

  • New Trip

Update date: 2025.12.16
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When preparing for a trip or business trip, one thing that can be surprisingly difficult to decide is the size of your suitcase. From a short one-night trip to a week-long overseas trip, it's important to choose the perfect suitcase size for each trip.

Many travelers experience problems such as "I don't know which size is best," "My luggage won't fit," and "I'm worried about whether I can carry it on board."

In this article, we will clearly explain tips on choosing the right suitcase size based on the number of nights you will be staying , and also provide detailed information on carry-on size and checked baggage rules .

Choose the perfect suitcase that suits your travel style and purpose to make your trip more comfortable!

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table of contents

1. Why is choosing the right suitcase size important?

2. Suitcase size and capacity guidelines based on number of nights

1. The perfect suitcase for a 1-3 night trip

2. The best suitcase for trips of 4 to 7 nights

3. The best suitcase for trips of 7 nights or more

3. Carry-on and checked baggage size rules

4. Tips for choosing a suitcase for different occasions!

6. Summary

FAQ (Frequently Asked Questions)

1. Why is choosing the right suitcase size important?

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Choosing the right size suitcase can have a big impact on your travel comfort. Choosing the right size will make managing your luggage easier and reduce stress during your trip. However, if you choose the wrong size, your luggage may feel heavy during travel, not fit in the bag, or exceed airline regulations and incur additional charges.

What happens if you choose the wrong size?

If you don't choose the right size, the following problems will occur:

・Suitcase that is too large : If you choose a suitcase that is larger than necessary, it can cause inconvenience during travel. Large suitcases can also be heavy and difficult to carry.

- A suitcase that is too small : On the other hand, if your suitcase is too small, you won't be able to fit all the items you need for your trip, and you'll have to compress your luggage.

Tips for choosing the right size

When choosing a suitcase, consider the purpose of your trip, the number of nights you will be traveling, and the amount of luggage you will be carrying, and choose the size that best suits you.

Use the following points to help you find the perfect suitcase for your trip.

- Short trips (1-3 nights) : A lightweight and compact size (20L-40L) is ideal.

For domestic travel or business trips, carry-on size is convenient.

- Medium-term trips (3 to 5 nights) : A suitcase of 40L to 60L is recommended.

This capacity is just right for trips to Europe or long domestic trips.

- Long-term trips (7 nights or more) : A large-capacity suitcase of 60L or more is required.

For family trips or long trips abroad, a larger suitcase is ideal.
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2. Suitcase size and capacity guidelines based on number of nights

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When choosing a suitcase, the most important thing is to choose one with the right capacity for your trip. Let's take a closer look at the optimal capacity depending on the number of nights you'll be traveling. We'll explain the best size for each number of nights and how to choose the perfect suitcase for each situation.

Liter count chart

泊数 容量目安 おすすめシーン
1泊2日 20～30リットル 国内小旅行、出張、機内持ち込み
2泊3日 30～40リットル 国内旅行、アジアへの短期旅行
3泊4日 40～60リットル 国内長め旅行、海外旅行
4泊5日～1週間 60～80リットル 海外旅行、長期出張
1週間以上 80リットル以上 長期旅行、留学、家族旅行
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・Tip : The amount of luggage you bring will vary depending on the season and your purpose, so it's a good idea to leave yourself an extra 10-20% on top of your usual luggage amount.

1. A lightweight and compact suitcase for a two-day trip

For a two-day trip, a compact suitcase of 20-30 liters is ideal.

A carry-on size suitcase is convenient for short domestic trips and business trips.

Recommended for : short domestic trips, overnight business trips, hot spring trips

・Example of luggage : 1 set of clothes, toiletries, laptop and documents

・Points : Can be carried on board, making travel easy!

2. A 3-day, 2-night trip: A suitcase with a little extra space

A 30-40 liter suitcase is the perfect size for a 3-day, 2-night trip.

It's perfect for domestic travel or short trips abroad and gives you a little extra wiggle room.

Recommended occasions : domestic travel during long weekends, business trips for 2 nights and 3 days, short trips to Asia

・Example of luggage : 2-3 sets of clothes, 1 pair of shoes, cosmetics, small souvenirs

・Point : If you have a suitcase with expansion capabilities, you don't have to worry even if your luggage increases!

Recommended suitcases for a 2-day, 1-night trip or a 3-day, 2-night trip:

0201 Extended Type

40+9L｜Pink

0702Plus Front Open

42L | Purple

1302 Front Open

40L | Gray
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3. 3-night, 4-day trip: Ideal for longer domestic trips or overseas trips

For a 4-day, 3-night trip, a 40-60 liter suitcase is perfect.

It is also suitable for long domestic trips and overseas trips to Europe, America, etc.

Recommended occasions : Golden Week or summer vacation trips, 3-night, 4-day overseas trips

・Example of luggage : 3-4 sets of clothes, jacket, space for souvenirs

・Tip : The amount of luggage you carry will change depending on the season and climate, so it's a good idea to choose a bag with a little extra capacity.

4. Trips of 4 nights, 5 days to 1 week: Ideal for long-term business trips and overseas travel

For a week-long trip, a 60-80 liter suitcase is ideal.

It is also ideal for long-term overseas trips, business trips, and family trips.

Recommended for : European trips, one-week business trips

・Example of luggage : 5-7 sets of clothes, 2 pairs of shoes, cosmetics, guidebook

・Point : The durable hard type is popular.

Recommended suitcases for trips of 3 nights and 4 days , or 4 nights and 5 days to 1 week:

0201Plus Extended Type

60+14L | Gray

0501 Front open

55+11 L | Oatmeal Gray

0801 Extended Type

60+14L｜Light blue
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5. Long-term trips (over a week): You need a large-capacity suitcase

For long-term trips of more than a week, studying abroad, or moving, you will need a large-capacity suitcase of 80 liters or more.

Since you will be carrying a lot of luggage, the trick is to choose a lightweight yet sturdy model.

Recommended for : 2-week overseas trips, 1-month study abroad trips, family trips

・Example of luggage : 10 or more sets of clothes, outerwear appropriate for the season, souvenirs and daily necessities

・Key point : Even if the bag has a large capacity, check that the casters are smooth and the handle is easy to grip!

Recommended suitcases for trips longer than a week:

1101 Frame Type

95L | Gray

0502 Extended Type

100+19L | Champagne Gold

0211 Olympic Design

105L | Midnight Green
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3. Carry-on and checked baggage size rules

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When choosing a suitcase, it is very important to understand the size restrictions of the airline . In particular, there are strict rules regarding the size of carry-on and checked baggage , and regulations vary depending on the airline, so if the suitcase you choose does not comply with the regulations, you may be charged an additional fee or may not be able to check it in.

Carry-on rules: Check your airline's regulations!

Carry-on suitcase sizes vary depending on the airline,

Generally, there are size restrictions as follows:

・Domestic flights (100 or more seats) :

・Size: 55 x 40 x 25 cm or less (total of three sides is 115 cm or less)

・Weight: Within 10kg (depending on the airline)

・Domestic flights (less than 100 seats) :

・Size: Within 45 x 35 x 20 cm (total of three sides within 100 cm)

・Weight: Within 10kg

・International flights (many airlines) :

・Size: Within 55 x 40 x 20 cm

・Weight: 7-10kg (varies depending on the airline)

The difference between LCCs (low-cost carriers) and major airlines

・LCC (Low-cost carrier) :

・LCCs often have very strict restrictions on carry-on luggage, including size and weight.

They have more stringent rules than other airlines.

For example, Ryanair allows carry-on luggage up to 40x20x25cm and a weight limit of 10kg .

・Major airlines (ANA, JAL, Emirates, etc.):

- Major airlines generally limit carry-on luggage to 55 x 40 x 25 cm (total of 115 cm across), but there are slight differences in weight and capacity.

For example, ANA limits carry-on luggage to 55 x 40 x 25 cm and 7 kg , but the carry-on baggage allowance may be increased for business and first class passengers.

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Checked baggage size rules: The total of the three sides must be within 158cm

Most airlines have a rule that checked baggage size must be within 158cm in total, three dimensions . In addition to this, there are weight restrictions. Most airlines generally limit checked baggage in economy class to 20-23kg .

・Size restrictions : Total of three sides must be within 158cm (including handles and casters)

・Weight limit : 20-23kg (depending on the airline)

<Related Articles>

・Carry-on size

・About bringing suitcases onto the Shinkansen

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4. Tips for choosing a suitcase for different occasions!

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The way you choose a suitcase depends on the purpose and occasion of your trip. Here, we will explain in detail the key points to consider when choosing a suitcase that suits your needs for family trips , business trips , and personal trips .

1. Business trip: The perfect suitcase for business

When traveling on business, a carry-on suitcase is convenient.

It would be even more convenient if there were dividers for storing documents and PCs.

・Recommended size : 40L to 50L

・Tip : Choose a carry-on size bag that can easily store documents and a PC.

Business suitcases

2. Family Travel: Large Capacity and Efficiency

For family trips, you'll need a large-capacity suitcase of at least 60L .

The expansion function is especially useful, as it gives you peace of mind even if you end up with a lot of souvenirs.

・Recommended size : 80L to 100L

Tip : Choose a model with a large capacity that makes it easy to pack your belongings.

Suitcases for family trips

3. International Travel: Lightweight and Stylish Suitcases

When traveling abroad, you need a suitcase that is lightweight and well-designed.

It's the perfect size for trips of 3 to 5 nights.

・Recommended size : 40L to 60L

Tip : Choose a lightweight, easy-to-carry model with a design you like and you'll have a fun trip.

Suitcases for overseas travel
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summary

Choosing a suitcase depends on your travel style and the occasion. Choosing the right capacity based on the number of nights you'll be staying and your purpose, as well as prioritizing functionality that suits the occasion you'll actually be using it for, will ensure a comfortable trip. New Trip suitcases are lightweight, highly functional, and stylish, making them the perfect travel companion.

- For short trips or business trips, choose a size of 40L to 50L .

- For family trips or long trips, choose a large capacity of 60L to 100L .

- For overseas travel , a bag with a capacity of 40L to 60L that combines design and functionality is ideal.

Choose a suitcase that suits your travel style and enjoy a comfortable and wonderful trip!

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FAQ (Frequently Asked Questions)

Q1. スーツケースの容量はどうやって選べばいいですか？

A1：旅行の泊数や荷物量によって容量を決めましょう。一般的に、1泊〜2泊は20〜30L、3泊〜4泊は40〜60L、1週間以上の旅行には60L以上が目安です。出張の場合は、機内持ち込みサイズの40L〜50Lが便利です。

Q2. 海外旅行の場合、スーツケースはどれくらいのサイズが必要ですか？

A2：海外旅行には、40L〜60Lのスーツケースが最適です。短期旅行（3〜5泊）なら40L〜50L、長期旅行（1週間以上）なら60L以上を選ぶと良いでしょう。

Q3. 機内持ち込みサイズのスーツケースを選ぶコツは？

A3：機内持ち込み可能なスーツケースを選ぶ際は、航空会社の規定に合わせたサイズ（55×40×25cm以内）を確認しましょう。LCC航空会社ではサイズ規制が厳しいことが多いため、特に注意が必要です。

Q4. 家族旅行の場合、スーツケースはどのサイズが便利ですか？

A4：家族旅行では、80L〜100Lの大容量スーツケースを1つ使うか、40Lのスーツケースを2つ用意するのが便利です。お土産や荷物が増えても対応できる拡張機能付きモデルを選ぶとさらに安心です。

Q5. スーツケースのセキュリティ機能にはどのようなものがありますか？

A5：セキュリティを強化するためには、TSAロックや高強度フレームが搭載されたスーツケースを選びましょう。特に海外旅行では、TSAロックが標準となっており、空港でのセキュリティチェックもスムーズです。

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About "New Trip"

New Trip is a brand that provides high-quality travel products for everyone who truly enjoys traveling.

We have a wide selection of essential items for travel, from suitcases to convenient accessories.

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And we have a clear belief in "improving product quality."

In order to provide users with products that exceed their expectations, all designs, materials, and processes for New Trip products are

They are carefully selected to improve the user experience."

We plan and sell suitcases and travel accessories under the slogan "Discover a new journey!"

As after-sales care, we offer a one-year free repair and replacement guarantee (for defects under normal use),

We provide services that are tailored to the users.

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