Disaster Prevention Day: How Many Changes of Clothes Should You Pack in an Emergency Backpack? Emergency Clothing and Merino Wool
Drinking water, emergency food, a flashlight, and a portable charger. These may be the first things that come to mind when you think about what belongs in an emergency backpack.
But how manychanges of clothes do you have packed?
How many T-shirts do you need? What about underwear and socks? Are short sleeves enough, or should you also pack a long-sleeve top? And with limited space, what kind of fabric should you choose?
Ahead of Disaster Prevention Day on September 1, let us take a closer look at clothing preparedness.
Do You Need Clothes in Your Emergency Backpack?
When preparing for a disaster, it is natural to prioritize water and food. However, if an evacuation lasts for an extended period, clothing and changes of clothes also become essential.
The examples of emergency supplies published by Japan’s Fire and Disaster Management Agency include clothing, underwear, blankets, and towelsalongside drinking water, food, and first-aid supplies. The Tokyo Metropolitan Government also lists changes of clothes among the items to take when a prolonged evacuation is expected.
Depending on the type of disaster and where you live, staying at home may not be possible. You may need to move to an evacuation shelter, sleep in a car, or live through power and water outages in conditions very different from everyday life.
- You may not be able to do laundry right away.
- Even if you sweat, you may not be able to change immediately.
- Temperatures may vary significantly between day and night.
- Heating or air conditioning may be unavailable or limited.
- There is a limit to how much you can carry during an evacuation.
That is why, when reviewing your emergency backpack, it is important not only to ask whether it contains a change of clothes, but also to consider what to pack and how much.
How Many Changes of Clothes Should You Pack?
There is no nationwide rule for adults specifying an exact number of T-shirts or pairs of underwear.
The amount of clothing you need varies greatly depending on your household, the season, region, evacuation method and duration, and your physical condition.
The following isone practical exampleyou can use when reviewing your own emergency backpack.
The quantities above are not official requirements set by a public authority. They are examples prepared by C-one to help you review your emergency backpack. Adjust them according to your household, age, season, region, and expected evacuation period.
Packing More Is Not Always Better
Packing many clothes may feel reassuring, but an emergency bag must remain light enough for you to carry while evacuating.
The Tokyo Metropolitan Government also advises that emergency suppliesshould not be so heavy that they restrict your movement.
The goal is therefore not simply to increase the number of items.
Choose clothes that remain as comfortable as possible, even when you pack only a few.
This is another useful perspective when preparing an emergency backpack.
Five Things to Consider When Choosing Emergency Clothing
In everyday life, we often choose clothes based on design, color, and silhouette. Clothing for an emergency, however, requires a slightly different perspective.
Why Merino Wool Is Worth Considering
When people hear “wool,” many first think of winter sweaters and coats.
However, fine-fiber merino wool is also widely used for T-shirts, base layers, and outdoor clothing.
Merino wool offers moisture management, temperature regulation, odor resistance, and a soft feel against the skin .
These qualities are useful not only in everyday life, but also in emergencies when laundry and temperature control may not be available as usual.
Wool fibers absorb water vapor and release it outward. This ability to reduce discomfort caused by sweat and humidity inside clothing is one of merino wool’s key benefits.
Wool can absorb odor molecules from sweat into its fibers and hold them until washing. This is particularly useful when daily laundry is not possible.
Wool combines moisture management with insulation, helping maintain a comfortable environment inside clothing in both warm and cold conditions. It is also useful between seasons.
Unlike the common image of wool as itchy, fine-fiber merino wool is soft and flexible, and is often used for garments worn directly against the skin.
Wool in a Summer Emergency? Clothing for Every Season
September 1 still falls within Japan’s hot season, so you may wonder whether wool would feel too warm in an emergency backpack.
Merino wool, however, is not only for winter. Lightweight merino uses its moisture-management properties in spring and summer T-shirts and outdoor base layers.
Sweat, Humidity, and Air-Conditioning Differences
Managing sweat is especially important in hot weather. Evacuation shelters may also create a temperature difference between the heat outdoors and air-conditioned indoor spaces. A lightweight short-sleeve top combined with a long-sleeve top or extra layer makes it easier to adjust.
Cold, Temperature Swings, and Layering
In colder weather, rather than relying on one heavy garment, it is useful to layer a T-shirt, long-sleeve top, and outer layer so you can adjust as needed. The comfort of the layer closest to your skin also matters.
You Do Not Need to Buy Special Disaster-Only Clothing
Although this article focuses on clothes for an emergency backpack, you do not need to buy a special T-shirt and store it solely for disaster preparedness.
The idea of using everyday products and services in emergencies is known as “Phase Free”.
Instead of storing clothes exclusively for emergencies, consider using garments you already wear, know fit you well, and find comfortable when an emergency occurs.
This is a practical form of preparedness that is easy to maintain.
Clothes left in an emergency backpack for a long time may no longer suit the season or fit your current body.
On Disaster Prevention Day, check not only the expiration dates of your water and emergency food, but also whetheryou can still wear the clothes currently in your backpack.
Emergency Backpack Clothing Checklist
← Scroll horizontally to view →
| Item | What to Check | Review Point |
|---|---|---|
| T-shirts and Base Layers | Can they handle sweat and humidity? | Confirm that the fabric remains comfortable during extended wear. |
| Underwear | Are enough changes included? | Also confirm the current size. |
| Socks | Is there a spare pair if they get wet? | Confirm that the thickness suits the season. |
| Long-Sleeve Top | Can it handle cool mornings and evenings? | Even in summer, one lightweight item makes temperature adjustment easier. |
| Extra Layer / Insulating Clothing | Does it suit the season? | Switch summer and winter items regularly. |
| Towel | Is a clean towel packed? | A lightweight towel takes up less space. |
| Total Weight | Can you actually carry it while walking? | Make sure you have not packed too many clothes. |
Frequently Asked Questions About Emergency Backpacks and Clothing
Your Everyday Shirt, Ready for an Emergency
When a disaster occurs, your first priorities are to secure your safety and prepare essential water, food, and medicine.
After that, when you next open your emergency backpack, remember to check the clothes inside.
Is there a change of clothes?
Does it fit you now?
Is it appropriate for the season?
Would it remain wearable if laundry were unavailable?
Instead of adding special “disaster clothing,” consider whetherthe clothes you wear comfortably every day can also help in an emergency.
C-one believes that clothing designed to serve both everyday life and emergencies can be one part of preparedness for the future.
Ahead of Disaster Prevention Day on September 1, review not only your emergency food and water, but alsothe changes of clothes in your emergency backpack.
C-one Merino Wool T-Shirts
C-one makes T-shirts from fine Super100’s merino wool at sewing factories in Japan. Enjoy their comfort as part of everyday life, while keeping a dependable layer ready for unexpected situations.
