Carry-on Suitcase Guide: International, Domestic, and LCC Rules and How to Choose

  • New Trip

Update date: 2025.10.10
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A carry-on size suitcase is essential for international travel, domestic business trips, and short weekend trips.

However, many people may be wondering, " The size and weight of carry-on luggage varies every time I fly..." or "Are there different regulations for domestic and international flights ?" We often hear that low-cost carriers ( LCCs ) are particularly strict.

In this article, we will thoroughly explain the sizes and regulations for carry-on suitcases . After reading this article, you will no longer have to panic at the airport. Choose the perfect carry-on suitcase and enjoy a smart trip!

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⚡ 一目でわかる結論

  • 国内線の機内持ち込み最大サイズは「115cm以内（例：55×40×25cm）」が基本。
  • LCC（Peach・Jetstar）は重量制限7kgが多く、他社より厳しめ。
  • 前開きスーツケースやUSBポート付きモデルなら、移動中の取り出しがスムーズ。

table of contents

1. Why are there regulations regarding carry-on suitcases?

2. [Domestic Flights] Carry-on Suitcase Regulations

3. [International Flights] Carry-on Suitcase Regulations

4. [LCC] Carry-on suitcase regulations

5. How to choose the right carry-on suitcase

6. Three recommended carry-on suitcases

1. New Trip 0201: A well-balanced, classic model

2. New Trip 0501: A multi-functional model ideal for business trips

3. New Trip 1302: A model that combines durability and design

7. Important Notices and Frequently Asked Questions (FAQ)

8. Summary

Why are there regulations regarding carry-on suitcases?

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Let's start with the basic rules. There are two main reasons why there are size and weight restrictions on carry-on baggage:

  • Ensuring safety : Excessively large luggage can block aircraft aisles and emergency exits, hindering evacuation in the event of an emergency.
  • In-flight storage space : Overhead bins are limited, so we want to ensure that all passengers have equal access to the space.

Related article : " How to choose the best luggage and suitcase for a 3-night, 4-day trip "

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[Domestic Flights] Carry-on suitcase regulations

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Regulations for domestic flights in Japan vary depending on the number of seats on the aircraft used.

  • For aircraft with 100 or more seats : Total dimensions of three sides must be within 115cm (e.g. 55cm x 40cm x 25cm)
  • For aircraft with fewer than 100 seats : Total dimensions of three sides must be within 100cm (e.g. 45cm x 35cm x 20cm)

The weight of both items is generally within 10 kg . Particular care is required when using small aircraft, such as flights to remote islands.

主要航空会社別サイズ一覧表（国内線）

航空会社 代表サイズ（目安） 3辺合計 重量 備考
ANA 55 × 40 × 25 cm 115 cm 10 kg 国内線・国際線で共通
JAL 55 × 40 × 25 cm 115 cm 10 kg 国際線は1個まで＋身の回り品可
Skymark 55 × 40 × 25 cm 115 cm 10 kg 身の回り品＋手荷物で合計10kg以内
Solaseed Air 55 × 40 × 25 cm 115 cm 10 kg 手荷物＋身の回り品の合計10kg以内

carry-on suitcase
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[International Flights] Carry-on suitcase regulations

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Regulations for international flights are relatively uniform, but there are slight variations between airlines. In general, the following rules apply:

  • Size : The sum of the three sides must be within 115cm (e.g. 55cm x 40cm x 25cm).
  • Weight : Approximately 7kg to 10kg .
  • Quantity : Usually, you are allowed one piece. In addition to this, you can bring one additional personal item such as a handbag or laptop bag.

主要航空会社別サイズ一覧表（国際線）

航空会社 サイズ上限（3辺合計） 重量制限 備考
ANA 55×40×25cm以内（115cm） 10kg 国際線・国内線共通
JAL 55×40×25cm以内（115cm） 10kg 国際線も同規定
シンガポール航空 55×40×20cm以内（115cm） 7kg×2個まで 重量制限に注意
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*There are generally no weight restrictions on carry-on baggage on flights to and from North America, but there are exceptions on some routes.

Related article : " How to Choose a Carry-On Suitcase for International Flights "

carry-on suitcase
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[LCC] Carry-on suitcase regulations

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Low-cost carriers (LCCs) tend to have the strictest baggage regulations.

  • Weight : Generally, the maximum weight limit is 7kg for both international and domestic flights.
  • Number of pieces : In most cases, the total number of carry-on bags ( suitcases ) and personal items is limited to one or two pieces.

In particular, they are very strict about overweight and oversized items, and you will have to pay an additional fee.

主要LCCの規定

航空会社 3辺合計 重量
ピーチ (Peach) 115cm以内 7kg
ジェットスター (Jetstar) 115cm以内 7kg
スプリング・ジャパン 115cm以内 7kg

【LCCごとの注意点】ここが要チェック！

格安航空（LCC）は、通常の航空会社より手荷物ルールが厳しめです。代表的な2社のルールを確認しましょう。

✈ Peach（ピーチ・アビエーション）

  • 機内持ち込みは合計7kgまで（ハンドバッグ含む）
  • サイズ上限：3辺合計115cm以内（55×40×25cm）
  • 座席下に入るバッグを含め、持ち込みは2個まで

✈ Jetstar（ジェットスター）

  • 機内持ち込みは合計7kgまで（有料オプションで10kgに拡張可能）
  • サイズ上限：3辺合計115cm以内（56×36×23cm）
  • 持ち込み手荷物は1個＋小物1個まで

✈ スプリング・ジャパン（Spring Japan）

  • 機内持ち込みは合計7kgまで（手荷物1個＋身の回り品1個）
  • サイズ上限：3辺合計115cm以内（56×36×23cm）
  • 重量超過は追加料金が必要
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How to Choose the Right Carry-On Suitcase

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With so many different regulations in place, we'll introduce some tips for choosing the right suitcase .

Meet the strictest LCC regulations

If you are likely to fly with multiple airlines, the wisest choice is to comply with LCC regulations ( total of 115cm across , 7kg in weight ). This will ensure peace of mind no matter which airline you fly with.

Choose by capacity and purpose

  • Trips of 1 to 3 nights : A capacity of around 30L is recommended.
  • For trips of 3 to 5 nights , we recommend a capacity of around 40L .

Choose by functionality

  • Material : Lightweight and durable polycarbonate is a popular choice.
  • Casters : We recommend double casters , which are stable and quiet.
  • Front-opening function : A convenient feature that makes it easy to access your luggage even in small spaces such as airport waiting rooms.
  • USB ports : More and more carry- on suitcases are being made available that allow you to charge your smartphone or other devices while traveling.

Related article : "The Complete Guide to Choosing the Right Suitcase Size! Capacity Guide by Number of Nights Traveled [2025 Edition] "

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3 Recommended Carry-On Suitcases

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So far we've looked at carry-on sizes and how to choose one, but you may be wondering which suitcase to choose. Here we'll introduce three models that we particularly recommend based on functionality, design, and purpose.

New Trip 0201: A well-balanced classic model

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If you're unsure which model to choose, the New Trip 0201 is a surefire choice.

  • Recommended points : This is a highly rated suitcase, having been ranked second in My-Best's July 2025 " Suitcase Ranking for Overseas Travel ."
  • Features : Made of lightweight and durable polycarbonate and ABS materials , this suitcase features 360-degree rotating, silent casters for smooth movement. Its well-balanced functionality makes it ideal for first-time carry-on suitcase buyers.

New Trip 0201

Amazon Prime Thanksgiving Suitcase Best Seller !
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New Trip 0501: A multi-functional model perfect for business trips

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" New Trip 0501 " is especially recommended for those who frequently travel for business or short business trips.

  • Side-opening front opening : This convenient design allows you to quickly access your laptop, documents, and small items without having to fully unfold your suitcase, even in a small airport waiting room or on the plane.
  • Expansion function & USB port : Equipped with an expansion function that allows you to easily store more luggage while traveling, and a USB charging port for convenient charging of smartphones and other devices, this suitcase is designed for convenience while on the go.

New Trip 0501

Highly recommended for business travelers and business people !
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New Trip 1302: A model that combines durability and design

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The New Trip 1302 is an aluminum suitcase recommended for those looking for durability and luxury.

  • Material : Aluminum alloy with anodized surface for scratch and corrosion resistance. The luxurious design makes it perfect for those who want to stand out from the crowd.
  • Features : The deep, spacious storage space allows you to neatly store bulky items. Furthermore, the 10-position adjustable carry bar and American-made, quiet casters allow for comfortable movement on any surface.

New Trip 1302

A luxurious suitcase made of aluminum with emphasis on durability !
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Important Notices and Frequently Asked Questions (FAQ)

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Here are some points to keep in mind when using a carry-on size suitcase.

  • Prohibited items: Liquids must be less than 100ml, and cutlery must be checked in.
  • Repair warranty: New Trip comes with a 1-2 year warranty. Please check at the time of purchase.

Q1: Can I carry mobile batteries or liquids on board?

A: It is not permitted to put a mobile battery in your suitcase and check it in as checked luggage. Always carry it in your carry-on luggage. Liquids must be in a container of 100ml or less and placed in a transparent zippered bag (capacity 1L or less).

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Q2: Can I bring two carry-on suitcases?

A: Normally, you are only allowed to bring one carry-on suitcase, but you can bring personal items (handbags and laptops) separately from the suitcase. However, LCCs may have restrictions on the number and weight of items, including personal items.

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Q3: Can I change my suitcase to checked baggage free of charge?

A: If your suitcase exceeds the size or weight regulations, you may be able to check it in free of charge, but most low-cost carriers will charge you an additional fee. To avoid panicking at the airport, be sure to check the size and weight in advance.

This will prevent any issues with carry-on size suitcases.

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summary

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The size and regulations for carry-on suitcases vary depending on the airline and route, but as long as you keep in mind the points explained in this article, you'll be fine.

"Comply with LCC regulations (total of three sides: 115cm, 7kg)"

If you choose a suitcase based on these criteria, you can enjoy a safe and secure trip, whether it's an international or domestic flight . Before you depart, be sure to check the latest information on the official website of the airline you'll be using, and start your journey smartly.

For details on recommended carry-on size suitcases, check out the official website or Amazon!

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