How to Choose an S-Size Suitcase | Carry-on & Recommended Models

New Trip

Update date: 2025.10.11

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When preparing for a trip or business trip, many people wonder, "What size suitcase should I choose?"
The small size suitcase in particular is a popular size that is perfect for short trips or business trips of 2 to 3 nights .
However, size restrictions for carry-on luggage vary depending on the airline, and it is not uncommon for customers to end up buying something but not being able to bring it on board.

In this article,
👉 Basic size and capacity of small suitcases👉 Conditions for carry-on luggage👉 We will clearly explain the key points to consider when choosing one.

In addition, we will introduce recommended models that are lightweight, quiet, and durable .
After reading this article, you'll be sure to find the perfect suitcase for your travel style.

table of contents

1. What is an S-size suitcase? Basic size and features

- Insert size comparison chart (S/M/L)

2. Travel situations where small suitcases are useful

・"Key points at a glance"

3. How to choose an S-size suitcase

・"Key points for selection"

4. Three Recommended Small Suitcases [New Trip Series]

summary

Frequently asked questions (FAQ) about small suitcases

1. What is an S-size suitcase? Basic size and features

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「Sサイズ」とは、一般的に20〜38L程度の容量を持つスーツケースのことを指します。

An "S-size suitcase" generally refers to a suitcase with a capacity of around 20 to 38 liters .
As a guideline, this size is ideal for trips or business trips of 1 to 3 nights .
Many domestic airlines allow carry-on luggage as long as the total of the three dimensions is within 115cm (e.g. 55 x 40 x 25cm) and the weight is within 10kg .

スーツケースのサイズ比較表（例）

サイズ	容量目安	泊数目安	機内持ち込み
Sサイズ	約35L	1〜3泊	○（多くの航空会社で可）
Mサイズ	約60L	3〜5泊	✕
Lサイズ	約90L	7泊以上	✕

Advantages of S size

・Compact and easy to carry

- No need to check in at the airport, saving time

・Peace of mind knowing your luggage is close at hand on the plane

On the other hand, since the capacity is limited, it is not suitable for trips with lots of souvenirs and clothes .
It's important to determine whether the small size is truly suitable for your travel style and the amount of luggage you'll be carrying.

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Things to note when choosing a size S

Carry-on size may vary slightly depending on the airline.

・It is important to judge based on the external dimensions including the casters and handles.

・When traveling abroad, be aware of the weight restrictions (7kg, etc.) imposed by low-cost carriers (LCCs).

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2. Travel situations where small suitcases are useful

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Sサイズのスーツケースは、「必要なものだけをスマートに持ち運びたい」という人にぴったりのサイズです。

The small size suitcase is perfect for those who want to carry only what they need.
Although it is compact enough to be carried on board, it can still hold enough luggage for 2-3 nights.
It is particularly useful in the following situations:

Perfect for weekend trips or short trips of 2 nights and 3 days

Hotel check-in and check-out is smooth and easy, and it can be carried around without stress even when traveling in a city with lots of stairs and trains.

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For business use such as business trips and conferences

Minimize time loss by packing your laptop, documents, and change of clothes in a compact bag and bringing it on board.
It is ideal for short business trips as you can travel without checking in your luggage.

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For short stays such as concerts, events, or homecomings

Although it is not suitable for long-term stays, it offers excellent mobility when you want to travel with only the bare necessities.

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⚡ 一目でわかるポイント

移動の自由度が高い：預け入れ不要で出発〜到着がスムーズ。
短期旅行に最適：1〜3泊の出張や週末旅行で力を発揮。
電車移動や階段の多い行程に強い：取り回しがラク。

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3. How to choose an S-size suitcase

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「Sサイズ」とひとことで言っても、容量・構造・素材によって使い勝手は大きく変わります。

Even if it is simply called an "S-size suitcase," its usability varies greatly depending on its capacity, structure, and material.
Here are some tips to help you choose the right one without making a mistake.

1. Check carry-on size

The maximum size varies depending on the airline,
Choose a model with a total size of 115cm or less , based on the following dimensions: height 55cm x width 40cm x depth 25cm.
Also, since LCCs have weight limits (7kg, 10kg, etc.), a lightweight suitcase is recommended.

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2. The material is both lightweight and durable

PC (polycarbonate) material is lightweight and durable, making it a popular carry-on item.
ABS material is recommended for those who want to keep costs down.
If you travel frequently, a model with a PC + ABS hybrid structure is a safe choice.

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3. Check the storage and opening type

For business users, the "front-opening" type
If you mainly travel, the "double-sided opening" type is convenient.
Also, be sure to check out the additional features such as laptop storage and USB ports.

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4. The quality of the casters and handles is also important

Silent casters and adjustable handles ensure comfortable movement.
This difference becomes more significant for people who travel long distances frequently.

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🔎 選び方の要点（すぐ使える）

航空会社の機内持ち込み規定（55×40×25cm / 3辺115cm基準）を必ず確認。
軽量かつ耐久性のある素材（PC / PC+ABS）を優先する。
用途に応じて「フロントオープン」「USBポート」「高品質キャスター」を検討。

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4. Three Recommended Small Suitcases

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Here we introduce three small-size suitcases that you can choose based on your travel style and purpose .
Both models combine design and functionality, and are popular for being "lightweight and durable" and "easy to store."

1. New Trip TriPro 0501 | Smart opening and closing "front opening" model

「荷物の出し入れがラク」「PCをすぐ取り出したい」そんな人にぴったりなのが New Trip TriPro 0501

[New Trip] Suitcase with Front Opening, Expandable Storage, and Stopper 0501

👉 New Trip TriPro 0501 View product page

The New Trip TriPro 0501 is perfect for those who want to be able to easily take their luggage in and out and quickly access their PC.
The front-opening design allows it to be used smoothly in airport waiting rooms or small hotel rooms.
Although it is carry-on size, it has plenty of PC pockets and compartments.
Perfect for business trips or a one- or two-night city stay .

✅Points:

Front-opening design makes it easy to take out and put in your PC and documents

Silent casters with stoppers make it easy to move around

Equipped with a TSA lock and YKK zipper for security

Carry-on size (approximately 40L)

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2. New Trip 0201 Plus | Versatile model with expansion function and USB port

[New Trip] Suitcase with Expandable Storage, USB Charging, and Locking Function, 0201 Plus

👉New Trip 0201 Plus View product page

Next on our list is the 0201 Plus , recommended for travelers who prioritize functionality .
Even the small size comes with an expansion zipper so you can fit a little more inside.
In addition, it is packed with convenient features such as a USB port, caster stoppers, and luggage hooks .

✅Points:

Expandable capacity (approx. 40L → approx. 48L)

Comes with a USB port for charging on the go

Caster stoppers, luggage hooks, and drink stand included

Ideal for trips where you tend to accumulate a lot of luggage, such as business trips, short trips, and festivals

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3. New Trip FINO 0502 | A new standard that combines lightness and functionality in a small size

[NewTrip] Suitcase, PC Material with Expandable Function, HINOMOTO Ultra-Quiet Casters, 0502

👉 New Trip FINO 0502 View product page

The " New Trip FINO 0502 " is a model that combines elegance and robustness.
Made from 100% PC (polycarbonate) material, it is lightweight yet resistant to scratches and impacts .
Equipped with silent casters made by HINOMOTO , it can move quietly at airports and hotels.
It has expansion features , so you don't have to worry if your luggage increases while traveling.

✅Points:

Made of 100% PC material, it is lightweight and durable

Capacity expansion zipper for increased storage capacity

HINOMOTO silent casters for smooth running

Aluminum carry bar with smartphone stand

🧩 どのモデルを選ぶべき？

モデル名	主な特徴	こんな人におすすめ
New Trip 0501	フロントオープン／静音キャスター／TSAロック	出張や仕事でPC・書類を頻繁に出し入れする人
New Trip 0201 Plus	拡張機能／USBポート／多機能仕様	荷物が増えやすい旅行・充電が必要な移動が多い人
New Trip 0502	軽量ボディ／360°静音キャスター／スリム設計	取り回し重視・女性やシニアなど扱いやすさを優先する人

▶ Sサイズ全モデルを見る ▶ 機内持ち込みの規定を確認する

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summary

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For trips or business trips of 1 to 3 nights, an S-size suitcase is the best choice.
It is lightweight and easy to handle, and can even be carried on board, saving you time at the airport and the hassle of collecting your luggage.

Among them, New Trip's small size suitcase combines functionality and design.
You can choose the perfect bag to suit your travel style, with the 0501's front-opening design, the 0502's expansion capabilities, and the 0201 Plus's multifunctionality.

May your next trip be smoother and more comfortable. Enjoy your trip freely with this lightweight S-size suitcase .

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よくある質問（FAQ）

Q1. Sサイズスーツケースは何泊くらいの旅行に向いていますか？

A. 目安としては1〜3泊の旅行に最適です。出張や週末旅行、国内旅行など、荷物が多くないシーンで特に使いやすいサイズです。

Q2. Sサイズスーツケースは機内持ち込みできますか？

A. 多くの航空会社では、55×40×25cm以内・10kg以下であれば機内持ち込み可能です。ただし、LCCなど一部の航空会社では規定が異なる場合があります。

Q3. Sサイズでも拡張機能付きモデルはありますか？

A. はい。New Trip 0502などは、ファスナーを開くだけで容量を拡張できる機能を備えています。お土産など荷物が増えたときにも便利です。

Q4. Sサイズスーツケースのおすすめ素材は？

A. 軽量で耐久性に優れた「PC（ポリカーボネート）」または「PC+ABS」素材がおすすめです。New Tripのモデルはこの素材を採用しており、軽さと強さを両立しています。

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