更新日：2026.04.20

A guide to choosing the right suitcase size: The first step to making travel easier

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Good morning, fellow travel lovers! Have you ever made a mistake choosing the right size suitcase ? I had a bitter experience trying to get through a three-night stay with a small-size suitcase, but it didn't fit a bottle of wine I brought home as a souvenir, so I had to carry it all by hand.

To avoid such tragedies, today we'll be explaining the basics of suitcase sizes ! We'll be digging deeper into S, M, and L sizes in this series, so let's get the big picture straight away. Let's get started on the first step to making your trip easier!

table of contents

1. Suitcase sizes, types and features

1. Small suitcase

2. Medium-sized suitcase

3. Large suitcase

2. Tips for choosing a suitcase depending on the number of days you are traveling

3. Common mistakes when choosing suitcase size and how to avoid them

4. Tips for choosing the right suitcase size for each occasion

summary

FAQ

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一、スーツケースのサイズ種類と特徴

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Suitcases come in three main sizes : S, M, and L. They're divided like clothing sizes, which is simple, but knowing the characteristics of each will make it easier to choose.

Sサイズ（機内持ち込みスーツケース）

項目 詳細
外寸の目安高さ55cm以内（キャスター・ハンドル含む突起部込み）
容量の目安20〜40L
本体重量の目安2〜3.5kg
向いている旅行日数1〜3泊
最大のメリット機内持ち込みOK・手荷物預けが不要

Height within 55cm ( including wheels and handles ), capacity approximately 20-40L .

It's perfect for short trips of 1-3 nights , and its biggest appeal is that it can be carried on board .

The best thing about it is being able to move around freely without the hassle of checking it in.

Once, my checked luggage was delayed in Europe, and I had to wait in the lobby on my first day, and ever since then I've been hooked on the convenience of the small size.

<Recommended>

・New Trip Suitcase S size

⚠️ 注意：航空会社のサイズ規定は必ず確認！
航空会社の種類 機内持ち込みサイズの目安 重量制限
JAL・ANA (FSC) 3辺合計115cm以内 10kg以内
ピーチ・ジェットスター等 (LCC) 56×36×23cmなど (より厳しい) 7kg以内が多い

※ LCCはフルサービスキャリアより基準が厳しいため、出発前に必ず公式サイトで最新情報を確認してください。サイズはキャスターやハンドルなど突起部分を含めた外寸で計測されます。

Mサイズ（4〜7泊向けスーツケース）

項目 詳細
外寸の目安高さ60〜70cm
容量の目安50〜70L
本体重量の目安3〜4.5kg
向いている旅行日数4〜7泊
最大のメリット荷物＋お土産スペースのバランスが◎

Height: 60-70cm , capacity : 50-80L .

Perfect for a trip of 4-7 nights .

There's plenty of room for souvenirs, so you don't have to worry if you find yourself with too much luggage.

<Recommended>

・New Trip Suitcase M size

Lサイズ（長期・家族旅行向けスーツケース）

項目 詳細
外寸の目安高さ70cm以上
容量の目安90L以上
本体重量の目安4〜6kg
向いている旅行日数1週間以上・家族旅行
最大のメリット冬物コート・かさばる荷物も余裕

However, be aware of airline rules !

JAL and ANA have a carry-on standard of " a total of three dimensions of no more than 115cm ," but LCCs can be even stricter, requiring dimensions of 50cm x 40cm x 20cm . It's essential to check the airline's website in advance!

<Related Articles>

・"Make your travels more comfortable with New Trip carry-on suitcases"

・"The Complete Guide to Suitcases to Bring on the Shinkansen"
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二、旅行日数別・スーツケースサイズの選び方

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Choosing a suitcase based on the number of days you will be traveling will have a big impact on the amount of luggage you will have and how convenient it will be to travel.

This chapter will give you tips on choosing the best size and type for the length of your trip.

旅行日数 推奨容量 推奨サイズ ポイント
1〜2泊20〜30LS機内持ち込みで身軽に
3〜5泊30〜50LS〜Mお土産分の余裕も忘れずに
6〜7泊50〜70LMバランス重視の定番選択
8泊以上80L〜M〜L長期なら大は小を兼ねる
家族旅行90L〜L（複数も可）人数×荷物量で検討

The important thing is to have an idea of ​​" what to bring and how much to bring ." I tend to buy too many souvenirs, but I have a minimalist friend who said, "I went to Europe for a week with only a medium-sized suitcase!" I was impressed by how many possibilities there are depending on your packing skills. What's your travel style?

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三、スーツケースサイズ選びでよくある失敗とプロの回避法

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Here are some common mistakes when choosing a size and how to avoid them.

Choosing the wrong size can often cause inconvenience while traveling, so it's important to know the key points to avoid making mistakes beforehand.

・Your luggage won't fit in : If the capacity is insufficient, you'll have a hard time packing your luggage. Bigger is not always better, but choosing a size with a little more room will give you peace of mind.

・Pay attention to weight : A suitcase that is too large will be heavy and difficult to move around. It is important to choose a size that is appropriate for the amount of luggage you will have and to take weight into consideration.

・Pay attention to carry-on restrictions : Each airline has its own restrictions on carry-on luggage. It is important to choose a carry-on suitcase that meets the airline's regulations (e.g., 55x40x25cm).

To avoid making mistakes, it's important to check the size carefully beforehand and choose the best size for your travel purpose.

<Related Articles>

・"What you need when traveling and how to choose a suitcase"

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四、シーン別のスーツケースサイズ選びのポイント

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Choosing the right size suitcase for your travel needs will greatly improve your comfort.

This chapter introduces the optimal sizes for different purposes.

For business travel , a compact suitcase (30-40L) that can be carried on board is ideal. It allows for smooth travel and is convenient for carrying business documents and a laptop.

・Family travel : You will need a suitcase with a large capacity (60L or more). Focus on storage capacity so that you can store clothes and items for the whole family.

For solo travelers and backpackers : A lightweight suitcase (40-50L) is ideal for those who want to travel light and with minimal luggage. Its flexibility and ability to move around easily are its main advantages.

By choosing the perfect size for your travel needs, you can easily organize your luggage and travel smoothly.

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・おすすめ：Lサイズ（90L以上）または人数分のM

・代表者がLサイズを1個持つか、各自Mサイズを持つかはスタイル次第。子連れなら4輪キャスター・TSAロック付きが便利です。スーツケースカバーで家族の荷物を色分けすると空港での混乱も防げます。

New Trip 0502 スーツケース

7泊以上の長期・家族旅行におすすめ

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Lサイズ・100L｜PC素材+亜鉛合金コーナーパット

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・おすすめ：Mサイズ（40〜60L）の軽量タイプ

・移動が多い旅では「軽さ」が最大の武器。2kg台の超軽量モデルも登場しているので、本体重量を重視して選びましょう。ソフトケースタイプは容量の融通が利くのでおすすめです。

New Trip 0201 スーツケース

4〜7泊の国内・海外旅行におすすめ

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Mサイズ・60L｜ABS+PC

超軽量3.6kg 拡張機能 TSAロック

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まとめ：スーツケースサイズ選び

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This time we've introduced the basics of suitcase sizes . What did you think? S, M, and L each have their own appeal, and it's interesting to see how your choice changes depending on your travel style.

We'll be looking at each size in detail from now on, and next time we'll be giving a thorough explanation of the " S size "! I'll also be sharing tips for carry-on luggage, my favorite recommended models, and "packing techniques for getting through a three-night stay in an S size." Please look forward to it.


What size are you? Let us know in the comments. See you next time!

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FAQ(よくある質問)

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Q1. 機内持ち込みできるサイズって何cmまで？

A1：一般的には高さ55cm×幅40cm×奥行き25cm（車輪やハンドル含む、3辺合計115cm以内）が基準。 JALやANAはこれでOKだけど、LCC（格安航空）はもっと厳しくて50cm×40cm×20cmとかの場合もあるよ。航空会社のルールを事前にチェックするのが確実！

Q2. 大きいスーツケースだと何かデメリットある？

A2：あります！重量オーバーで追加料金、預け入れ時の破損や紛失リスク、移動時の持ち運びが大変とか。私はLサイズで駅の階段に苦戦したことあるから、移動多いなら要注意。

Q3. Sサイズで何泊までいける？パッキングのコツは？

A3：上手くやれば3泊、達人ならより長くも可能！コツは服を平らに畳む（丸めると意外とかさばる）、靴下や小物を隙間に詰める、かさばるものは現地調達。

Q4. 家族旅行だとどうやってサイズ選ぶ？

A4：Lサイズ1つをみんなで共有するか、Sサイズを人数分持つかの二択。子供と2人ならSサイズ2つで分担した方が楽だった経験あるよ。荷物の量と移動の多さで決めるとGOOD。

Q5. お土産たくさん買う場合、どうすればいい？

A5：最初からMかLサイズを選ぶか、折り畳めるサブバッグを持参。私はイタリアで革製品買いすぎて現地でバッグ追加したけど、スーツケースに余裕持たせるのが結局ラクだったよ。

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