How to Choose a Carry-On Suitcase for International Flights and New Trip's Recommended Models

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New Trip Editorial Department (Last updated: August 13, 2026)

International flight suitcase sizes explained | How to choose between carry-on and checked luggage

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When choosing a suitcase for an overseas trip or business trip,

many people wonder, "Can I carry this size on board?" or "Will it exceed the checked baggage size limit?"

For international flights, size and weight regulations are more detailed and vary by airline compared to domestic travel, so it's important to check in advance to avoid having to repack your bags right before departure.

Also, the appropriate suitcase size changes depending on the length of your trip and the amount of luggage.

This article will explain in detail the size regulations for suitcases used on international flights, estimated capacities based on the number of nights, and key points for choosing a suitcase.

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Table of Contents

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1. International Flight Baggage Size Regulations: Carry-on vs. Checked Baggage Differences

2. Examples of International Flight Rules by Airline

3. Guideline for choosing suitcase size based on number of nights and amount of luggage

IV. Important points to check before purchasing

5. New Trip Suitcases Recommended for International Travel

6. Frequently Asked Questions (FAQ)

7. Summary

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一、国際線のスーツケースサイズ規定｜機内持ち込みと預け入れの違い

While domestic flights often have relatively lenient regulations, international flights vary significantly depending on the airline and route, so it's always necessary to check in advance.

There are two main types of suitcases used for international flights: carry-on baggage and checked baggage.

Since the size and weight restrictions for each differ, it's important to first understand the basic rules.

・機内持ち込みできるスーツケースサイズ

項目	国内線	国際線
サイズ	3辺合計115cm以内（例：55×40×25cm）	3辺合計100〜115cm前後（航空会社・LCCで差あり）
重量	10kg前後（航空会社により異なる）	7〜10kg（LCCは特に厳しい）
個数	1個〜2個	1個〜2個（航空会社・運賃タイプによる）

The benefits of carry-on luggage include:

・Saving time checking in luggage at the airport counter

・No need to wait for luggage upon arrival

・Reduced risk of lost baggage

An S-sized suitcase is convenient for short trips or business trips with light luggage.

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・預け入れ荷物（受託手荷物）の違い

項目	国内線	国際線
サイズ	3辺合計158cm以内が一般的	3辺合計158〜203cmまで（航空会社・路線による）
重量	20kg前後	20〜32kg（クラス・航空会社により異なる）
個数	1個〜2個	1〜3個（クラス・運賃タイプで差あり）

On international flights especially, you need to pay attention not only to size but also to weight restrictions.

Even if you choose a large-capacity suitcase, you may incur excess baggage fees if you pack too much.

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💡 Editor's advice: When choosing a suitcase, check both the "total linear dimensions" and "weight limit." If you anticipate carrying more luggage, it's safer to choose a suitcase with ample capacity or an expandable model.

・預け入れ荷物（受託手荷物）の違い

Even for international flights, the following conditions vary depending on the airline:

・Carry-on baggage size limit

・Free checked baggage weight limit

・Number of baggage items limit

・LCC-specific additional fees

Therefore, it is important to check the official rules of the airline you will be using before purchasing a suitcase or traveling.

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二、航空会社ごとの国際線ルール例

For international flights, carry-on and checked baggage size and weight limits vary depending on the airline, route, and class of service.

For international flights, rules vary by airline, so check the following points:

・日本国内の主要航空会社（例：JAL・ANA）

航空会社	機内持ち込み制限	受託手荷物制限	備考
日本航空（JAL）	3辺合計115cm以内、10kgまで	3辺合計203cm以内、23kg/個、2個まで	エコノミー標準
全日本空輸（ANA）	3辺合計115cm以内、10kgまで	3辺合計158cm以内、23kg/個、0〜2個	エコノミー標準

💡 Point: For ANA, the sum of the three dimensions (length, width, height) must be within 158 cm.

・米国・欧州の主要航空会社

航空会社	機内持ち込み制限	受託手荷物制限	備考
デルタ航空	3辺合計115cm以内、10kgまで	3辺合計158cm以内、23kg/個、1個まで（ベーシックエコノミーは0個）	米国発着便
ユナイテッド航空	3辺合計115cm以内、10kgまで	3辺合計157cm以内、23kg/個、2個まで（ベーシックエコノミーは1個）	米国発着便
フランス航空 / KLM	3辺合計55 x 35 x 25cm	3辺合計158cm以内、23kg/個、2個まで	横幅が日本標準より5cm狭い
ルフトハンザ航空	3辺合計55 x 40 x 23cm	3辺合計158cm以内、23kg/個、2個まで	厚み2cm差に注意

・中東・東南アジアの主要航空会社

航空会社	機内持ち込み制限	受託手荷物制限	備考
カタール航空 (Qatar Airways)	50 x 37 x 25 cm	3辺合計158cm以内、23kg/個	高さ50cm以下、一般的な20インチでは持ち込めない
アティハド航空 (Etihad Airways)	50 x 40 x 25 cm	3辺合計158cm以内、23kg/個	横幅にも注意
エミレーツ航空	55 x 38 x 20 cm	3辺合計158cm以内、23kg/個	奥行き20cmで薄型指定、荷物は工夫が必要
タイ国際航空	55 x 40 x 25 cm	受託は重量制23〜30kg、個数制限なし	東南アジア路線は重量制が多い

💡 Customer Feedback: Previously, a Qatar Airways passenger reported that their regular S-sized suitcase was denied as a carry-on and had to be checked in because its height exceeded 50 cm.

・LCCの注意点

航空会社	機内持ち込み制限	備考
ライアンエアー (Ryanair)	40 x 20 x 25 cm	前座席下に置く「個人手荷物」サイズ、かなりコンパクト
イージージェット (easyJet)	45 x 36 x 20 cm	厚み20cmで制限厳しい
ピーチ航空 (Peach)	3辺合計203cm以内、20kgまで	標準料金では受託手荷物なし、追加購入可能
ジェットスター	1辺100cm以内、20〜40kg	受託手荷物はオプション購入

Key points:

For airlines with a height restriction of around 50cm, a typical 20-inch suitcase cannot be brought on board. You will need to choose an 18-inch class suitcase.
For airlines with strict depth and width restrictions, a thin or slim-type suitcase is recommended.
LCCs have strict "personal item size" restrictions, and standard 20-inch suitcases may not fit in the overhead compartments.

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三、宿泊日数・荷物量で選ぶスーツケースサイズの目安

When choosing a suitcase for travel or business trips, it's important to select a capacity that matches the number of nights you'll be staying and the amount of luggage you'll be carrying.

When choosing a suitcase for a trip or business trip, it's important to select a capacity that matches the number of nights you'll be staying and the amount of luggage you'll have. A good rule of thumb is to calculate "10L of capacity per night," which makes it easy to organize as follows:

宿泊日数	容量目安	サイズ目安	機内持ち込み/受託手荷物
1〜2泊	20〜30L	SS〜Sサイズ	機内持ち込み可能サイズ
3〜4泊	30〜50L	S〜Mサイズ	受託手荷物または機内持ち込み上限サイズ
5〜7泊	50〜80L	M〜Lサイズ	受託手荷物サイズ、拡張機能推奨
7泊以上	65〜100L以上	Lサイズ以上	受託手荷物、大容量モデル推奨

Short-term International Trips (1-3 nights)

For short international trips or business travel, size S is recommended.

With this size, you'll have enough space for essential clothing and toiletries.

Additionally, choosing a carry-on size will allow for smoother transit at the airport.

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International Travel for 4-7 Nights

For international trips of about a week, size M is the most convenient.

International travel tends to involve more luggage than domestic travel, and size S can sometimes be too small.

Especially since luggage tends to increase when returning home, choosing a slightly larger size will provide peace of mind.

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Long Trips of 7 Nights or More

For extended stays, studying abroad, or business trips, an L-size suitcase is suitable.

However, an excessively large suitcase can become a burden when moving around.

If you plan to use public transportation from the airport to your hotel,

it's important to consider ease of transport, such as taking two M-size suitcases instead of one L-size one.

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四、国際線用スーツケースを選ぶ4つのポイント

Be sure to check the latest airline regulations, and consider both carry-on and checked baggage.

In addition to size, there are other important points to consider for a comfortable overseas trip.

Lightweight
When traveling internationally, you'll spend a lot of time moving with your suitcase, such as navigating airports and making transfers.
Choosing a lightweight model can reduce the burden of movement.
Storage Capacity and Expansion Features
When traveling abroad, you often accumulate more souvenirs when returning, so a model with ample capacity is recommended.
A suitcase with expansion features can accommodate changes in luggage volume.
TSA Lock
For international travel, choosing a model equipped with a TSA lock provides peace of mind.
This is an essential feature to check for any international travel suitcase, especially for trips to the US.
Caster Performance
In foreign countries, you may encounter situations that put a heavy strain on your suitcase, such as cobblestone streets or long-distance travel.
Choosing casters with excellent quietness and maneuverability will allow for comfortable movement to and from airports and hotels.

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五、国際線旅行におすすめのNew Tripスーツケース

・短期海外旅行・出張なら「0201」

For those who prioritize lightweight design, the 0201 is recommended.

Lightweight design at approximately 2.8 kg
Carry-on size compliant
Equipped with an expansion feature

It is suitable for those who wish to reduce the burden of travel on short-term international trips or business trips.

New Trip 0201 スーツケース

S・40L｜ABS+PC

拡張機能コーナーパッド TSAロック超軽量設計

商品を見る

・1週間程度の海外旅行なら「0502」

If you prioritize storage capacity and comfort, the 0502 is recommended.

Lightweight and durable PC material
Silent casters
Expandable function

Even on international trips where luggage tends to increase, you can store everything with room to spare.

New Trip 0502 スーツケース

S・40L｜100%PC

拡張機能コーナーパッド TSAロック HINOMOTOキャスター

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・長期旅行なら「0211」

For long stays or family trips, we recommend the 0211.

Large capacity design
3:7 structure for excellent storage
Stable running performance

It can accommodate bulky luggage and a large amount of clothing, making it suitable for long trips.

New Trip 0211 スーツケース

M・65L｜ABS+PC

五輪設計コーナーパッド TSAロックストッパー付き

商品を見る

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六、よくある質問（FAQ）

Q1: 機内持ち込みで20インチサイズは安全ですか？

A1：航空会社によって高さ50cm以下など制限が厳しい場合があります。特に中東系や欧州LCCでは注意が必要です。

Q2: 受託手荷物の重量制と個数制の違いは？

A2：重量制は荷物総重量で判断、個数制は個々の荷物重量と個数で判断します。規定に応じて超過料金が発生します。

Q3: 長期旅行では大型スーツケースだけで大丈夫？

A3：荷物が多い場合は、重量超過や移動のしやすさを考え、2個に分けるのも有効です。

Q4: LCCで受託手荷物が必要な場合はどうすれば良い？

A4：チケット購入時に追加オプションで枠を確保するか、軽量小型スーツケースに収めることを検討。

Q5: 荷物が濡れないようにするには？

A5：ファスナー型は防水性に限界があるため、雨天時はレインカバー使用。フレーム型はゴムパッキンで水の侵入を防ぎます。

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七、まとめ

When choosing a suitcase for international flights, it's crucial to check both airline size regulations and your trip duration.

As a guide, choose an S-size for short trips, an M-size for trips around a week, and an L-size for longer trips, selecting the size that suits your travel style.

Additionally, checking features such as lightweight design, storage capacity, TSA lock, and caster performance can make your overseas travel more comfortable.
We invite you to achieve comfortable overseas travel with New Trip's suitcases.

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