New Trip Editorial Department Updated: 2026.07.25

How to protect your suitcase from rain | Waterproof cover guide

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Have you ever had the trouble of your suitcase getting soaked while traveling or on a business trip on a rainy day?
In fact, many suitcases are not "completely waterproof",

The design makes it easy for water to seep in through the casters and zippers .

So in this article,

"How to keep your luggage dry even on rainy days" and "The most effective way to protect your suitcase from rain"

Explained in an easy-to-understand manner.

We've put together some practical tips you can use right away, whether you're planning a rainy day today or a trip tomorrow.

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table of contents

1. Why are suitcases vulnerable to rain?

2. The real risks that occur on rainy days

3. Why a suitcase cover is the best choice for rainy days

4. Types of suitcase covers and how to choose them

5. Practical techniques for rainy days

summary

FAQ (Frequently Asked Questions)

一、雨の日にスーツケースで注意したい3つのポイント

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ファスナー部分からの浸水

Even if a suitcase looks sturdy, it is not actually "waterproof."
Many models tend to be vulnerable to rain for the following reasons:

荷物への水濡れ

If water gets inside your suitcase, the following items are particularly susceptible to damage:

  • Clothing: Can become moldy or develop an odor if wet
  • Electronic devices: Smartphones, laptops, cameras, etc., are at risk of malfunction
  • Documents: Important documents such as passports and airline tickets

It's especially recommended to store electronic devices and important documents in a waterproof pouch or Ziploc bag for peace of mind.

ケース表面の汚れ・滑りやすさ

Getting wet isn't the only problem on rainy days.

  • Muddy water adheres to the case surface.
  • Road grime accumulates around the casters.
  • Suitcases become slippery on wet floors.

Especially in places like station or hotel lobbies, there's a risk of your suitcase slipping and toppling over on wet floors. The performance of the casters and the contact surface with the floor are also important.

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二、雨の日のスーツケース対策は必要？おすすめの方法を比較

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When traveling on a rainy day, even if you think you're just a little wet,

In reality, the suitcase's weaknesses become immediately apparent.

Here we will introduce some common problems.

方法 防水性 コスト メリット 向いている人
何もしない △ 0円 手軽 短時間移動・晴天時
ビニール袋・バッグ △ 〜500円 安価・緊急対応 突然の雨・一時的な対策
防水カバー ◎ 1,000〜3,000円 全面保護・繰り返し使用 旅行・長時間移動
防水タイプケース ○ +10,000円〜 日常使用・カバー不要 頻繁に雨の日利用

多くの旅行者にとってバランスが良いのが防水カバー

Once purchased, it can be used repeatedly, offering excellent cost-performance.

Furthermore, it can be stored compactly when not in use, making it easy to carry when traveling without adding bulk.

While "doing nothing" is fine for short trips or light rain,

if you anticipate long journeys or heavy downpours, it's reassuring to have a waterproof cover ready.

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三、スーツケースカバーの種類と選び方

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There are various ways to protect yourself from rain.

The most effective, cost-effective, and easy method that anyone can use is a suitcase cover .
We will explain in an easy-to-understand manner the specific reasons why they are such a good match.

素材で選ぶ

素材 特徴 メリット 注意点
PVC
（ポリ塩化ビニール）		 防水性が高く
価格も手頃		 透明タイプが多く
中身が見える		 やや硬めで
装着に少し力が必要
TPU
（熱可塑性ポリウレタン）		 柔軟性があり
装着しやすい		 環境にやさしい素材 価格はPVCよりやや高め
EVA
（エチレン酢酸ビニール）		 軽量で柔らかい 価格が安い 耐久性がやや低い

サイズで選ぶ

The weakness of the suitcase is
- Zippers - Around the USB port - TSA lock - Small details such as pocket seams.

These areas are prone to deterioration when wet, and 80% of problems on rainy days are caused here.
By using a cover , moisture will not come into direct contact with the product, which will effectively prevent malfunctions, rust, and deterioration of the fabric.

装着方法で選ぶ

装着方式 特徴 メリット 注意点
ファスナー式 装着・取り外しが簡単 しっかり固定できる やや重い
伸縮タイプ 伸びる素材で装着が楽 軽量でコンパクト サイズ調整がしやすい

スーツケースカバーを選ぶときの注意点

  • Choose one slightly larger than the case size.
  • Choose a type that is easy to attach and detach.
  • Transparent types are convenient as you can see the contents.
  • If it comes with a storage bag, it is easy to carry.

New Trip offers waterproof covers available in S/M/L sizes.

Lightweight and easy to carry, providing peace of mind even in sudden rain.

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四、雨の日でも快適に移動するための実践テクニック

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出発前の準備

Even if we say suitcase cover,
Comfort varies greatly depending on the material, structure, and ease of use.
Here we will clearly summarize the points to consider when choosing a model that is strong on rainy days .

移動中の注意点

Check around the casters

・Muddy water tends to accumulate easily, so check frequently.
・Mud clogging the casters can hinder movement and cause malfunctions.

Avoid puddles

・Submerging the casters in water can cause malfunctions.
・Avoid puddles as much as possible when walking.

Umbrella in one hand, suitcase in the other

・Since both hands will be occupied on rainy days, choosing a lightweight model will make travel easier.
・A lightweight suitcase is especially recommended for long journeys.

電車・新幹線での移動

At the station on a rainy day,

it's easy to find yourself holding an umbrella in one hand and a suitcase in the other, so a stopper function is convenient.

New Trip 0701 Plus comes with a caster stopper, so you can rest assured that your luggage won't roll away even when traveling by train on a rainy day.

 

Additionally, if it has a front-opening function, you can quickly retrieve items without opening the entire suitcase when taking out luggage in the rain.

You can quickly store an umbrella or rain gear, saving you the trouble of searching for items with wet hands.

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五、雨で濡れたスーツケースのお手入れ方法

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On rainy days, the weak points of your suitcase are easily exposed, but with a little ingenuity you can significantly prevent it from getting wet or dirty.

We've put together some practical techniques you can use starting today.

表面の拭き方

Instructions:

　1. Wipe off water droplets with a dry towel.

　2. For small areas, wipe with a cotton swab or tissue.

　3. Air dry in a well-ventilated place.

 

Precautions:

・Drying with a hot hairdryer may deform the material.

・Avoid scrubbing vigorously with detergent, as this may damage the surface.

キャスターの泥汚れ

Dirt and sand tend to accumulate around the casters, so wipe them clean with a damp cloth.

If the casters are difficult to turn, gently scrub them with a toothbrush to easily remove dirt.

内部の湿気対策

If water seeps in through the zipper, follow these steps to remove the moisture:

　1. Open the suitcase and inspect the contents.

　2. Remove any wet clothing or items.

　3. Leave the suitcase open to dry in a well-ventilated area.

　4. Placing a dehumidifier inside will help prevent mold.

やってはいけないこと

Avoid the following actions, as they can damage your suitcase:

・Leaving it wet for extended periods: Can cause mold or rust

・Drying it with a high-heat dryer: May deform the material

・Scrubbing vigorously with detergent: Can scratch the surface

・Storing it while wet: Can cause mold and odor

It is important to always dry it thoroughly before storing.

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よくある質問（FAQ）

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Q1. スーツケースは雨に濡れても大丈夫？

A1：短時間の小雨なら問題ありませんが、長時間の雨や土砂降りでは、ファスナーの隙間から水が浸入する可能性があります。
防水カバーを使うか、帰宅後にしっかり乾燥させることが大切です。

Q2. 防水カバーは必要ですか？

A2：短時間の移動や小雨なら不要ですが、長時間の移動や土砂降りが予想される場合は、防水カバーがあると安心です。
一度購入すれば繰り返し使えるため、コストパフォーマンスも良好です。

Q3. スーツケースカバーのサイズ選び方は？

A3：ケースのサイズより少し大きめを選びましょう。
ぴったりサイズだと装着時にきつくて破れる恐れがあります。
商品説明の「対応サイズ」を確認してください。

Q4. 傘を持ちながらスーツケースを引く時の注意点は？

A4：片手に傘、片手にスーツケースが基本ですが、長時間移動する場合は、軽量スーツケースを選ぶと負担が減ります。
また、ストッパー付きモデルなら、停車時に両手を自由に使えて便利です。

Q5. 濡れたスーツケースをそのまま保管してもいい？

A5：いいえ、必ず乾燥させてから保管してください。
濡れたまま保管すると、カビや異臭の原因になります。
風通しの良い場所で自然乾燥させましょう。

Q6. 雨の日にスーツケースを引くとき、傘はどう持つ？

A6：片手に傘、片手にスーツケースが基本ですが、長時間移動する場合は以下の工夫がおすすめです。

・レインコートを着用する（両手が自由に使える）
・防水カバーを使い、傘を持たずに移動する
・ストッパー付きスーツケースで、停車時に両手を自由にする

特にレンタカーや駅から離れた場所への移動では、レインコートの方が快適です。

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まとめ

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When it comes to protecting your suitcase on a rainy day, preparation and aftercare are key.

 

Preventing your belongings from getting wet with a waterproof cover and wiping away water droplets and dirt after travel will allow you to use your suitcase comfortably for longer.

 

Furthermore, since you often have to move while holding an umbrella on rainy days, features that reduce the burden of movement, such as lightweight design and stopper functions, are also important.

 

At New Trip, we offer waterproof covers and functional suitcases to suit your travel style.

Choose items that will allow you to enjoy your trip with peace of mind, even on rainy days.

執筆・監修

New Trip編集部
本記事は、スーツケース・旅行用品ブランド「New Trip」の編集部により制作されました。
製品開発やユーザーの声を活かしながら、ユーザーに合ったスーツケースや、旅行・出張をより快適にするアイテムを発信しています。

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