For those who struggle with tidying up, the "One in, One out" rule can work wonders.

Every time you open your closet door, you feel a slight heaviness.
The hangers are packed with clothes, and the shelves are piled with folded but collapsing knits and T-shirts. In the back of the drawers are clothes you haven't worn in years. Accessories you forgot you bought. Bags and boxes you kept thinking you might use someday.

The entire room isn't messy, but the storage is clearly at its limit. Such homes are not uncommon.

An article on tidying up introduced by the German women's magazine BRIGITTE focuses precisely on this problem of "nothing more fits, yet things keep accumulating." Clothes, books, notebooks, daily necessities, kitchenware, stock items. As you live, things naturally accumulate. The problem is that there's no system for things to leave as they increase.

That's where the simple rule of "when you bring in something new, take out something old" comes into play.

This is the so-called "One in, One out" concept. When you buy a new dress, let go of a dress or top you haven't worn. When you get new sneakers, part with worn-out shoes or those you never wear. When you buy a new storage container, dispose of an old one with a mismatched lid.

It might seem like that's all there is to it. However, the strength of this rule lies in not making tidying up a special event.

For many people, tidying up tends to be something done all at once when there's time. You muster up the energy on a day off, pull everything out onto the floor, sort what you need and don't need, buy more storage supplies, and end up exhausted. Moreover, in a few months, you're back to the same state.

Why does it revert? The reason is simple. There are overwhelmingly more days when things increase than when they decrease.

Shopping, gifts, samples, sale items, bulk purchases, belongings that grow with children, hobby tools. In life, there are many moments when things enter the home. On the other hand, unless you're conscious of it, there are hardly any moments when things leave the home.

That's why it's necessary to pair the "entrance" with the "exit."

Tidying becomes painful because too many decisions are piled up

In a house with a lot of things, the real burden isn't just the things themselves.
"This is still usable"
"It's hard to throw away because it was expensive"
"I might wear it someday"
"I might be able to give it to someone"
"I don't want to decide now"

These unresolved decisions pile up and become a burden.

People who are not good at tidying up tend to have a cold impression of throwing things away. It feels like denying memories, wasting money, or doing something bad for the environment.

However, the "One in, One out" rule doesn't demand you to throw away a lot at once. It simply asks you to reassess one item that no longer suits you when you choose something new.

This smallness of "just one" significantly lowers the psychological hurdle.

When you try to reassess the entire closet, your brain quickly gets tired. But if you think, "Instead of putting in this new shirt, choose one shirt you haven't worn recently," it's easier to decide. The comparison is specific.

Right after buying something new, you're more aware of your preferences and lifestyle changes. What do you want to wear now? What colors do you want to choose? What materials feel comfortable? When these are clear, you can see the gap with what your past self chose.

It's not "still usable," but "am I using it now?"
"It's not "it was expensive," but "is it useful in my current life?"
"It's not "someday," but "has it been used in the past few months?"

When the axis of tidying changes, letting go becomes a task to align your life with your current self, not a punishment.

Place a "donation box" in the closet

To continue this rule effectively, place a small "letting go box" near your closet or storage.

It doesn't have to be a box. A paper bag, cloth bag, basket, or empty storage case will do. The important thing is to create a place where you can immediately put something when you're unsure.

For example, in the morning, while choosing clothes, you might feel that a certain piece no longer suits you. Previously, you might have put it back on the hanger. But if there's a donation bag there, you can put it in the bag instead of putting it back.

This difference is significant.

One reason tidying doesn't progress is that there's no temporary place for things you realize are unnecessary. When you start thinking about where to put things you've decided to let go, when to take them, or who to give them to, it becomes a hassle, and you end up putting them back in their original place.

So, first, create a pre-exit stage.
Gather things you think "I might not use this anymore" at the exit inside your home. When the box is full, take them out through recycling, donation, flea market, transfer, disposal, or other methods that suit the items.

The important thing here is not to turn the letting go box into a "box of indecision." If you leave it for months, it just becomes a new storage place. Decide on a system that leads to the next action, such as moving when the bag or box is full, reviewing once a month, or moving it near the entrance.

Why it's relatable on social media: "Small victories" over "big cleanups"

Posts about tidying up have long been popular on social media. Especially on Instagram, TikTok, and YouTube, topics like closet organization, 10-minute resets, donation boxes, living without buying, minimal storage, and before-and-after videos repeatedly become the talk of the town.

Common reactions include, "I can't do it all, but I can manage 10 minutes," "Putting things in a donation box feels easier than throwing them away," "I've started thinking about what to let go of before buying clothes," and "Even if I tidy up once, it goes back, so I need a rule to maintain it."

On the other hand, there are cautious opinions.
"Just 'One in, One out' isn't enough for a room that's already too full of things."
"If you reduce family members' belongings without permission, it can cause disputes."
"It's not suitable for sentimental items."
"When busy, the process of taking things for donation can stall."

These reactions indicate that tidying techniques are not universal. On social media, tidy rooms and beautiful storage catch the eye, but real life is more complex. Family composition, living space size, shopping frequency, work or childcare busyness, and attachment to sentimental items vary from person to person.

Still, the "One in, One out" rule resonates because it can be started without becoming a perfect minimalist.

There are several commonalities in tidying techniques supported on social media.
Things that can be done in a short time.
Results that are visible.
Not having to blame oneself.
Things that can be started today.
And the more you continue, the lighter your life becomes.

"One in, One out" meets these conditions.

Start on the "day you bought it"

The easiest time to start this rule is right after returning from shopping.

Before washing and putting away new clothes in the closet, choose one piece to let go of. Before putting a new book on the bookshelf, choose one book you won't read again. Before putting a new mug in the cupboard, take out one that's chipped or unused.

If you miss this timing, the items will go straight into storage, and old and new items will start to coexist. This increases the density of storage, making it harder to take out, find, and leading to buying similar items again.

Tidying isn't just about reducing items. It's also about returning to a state where you can grasp what you own.

When there are too many clothes in the closet, it feels like you have nothing to wear.
When there are too many books on the shelf, it's hard to find the book you want to read.
When there are too many tools in the kitchen, preparing meals becomes a hassle.
When there are too many cosmetics and samples on the bathroom counter, morning preparations slow down.

The more things you have, the more choices seem to increase, but in reality, the burden of decision-making also increases. Therefore, reducing isn't about making things inconvenient; it's also about regaining ease of use.

"Still usable" and "I use it" are different

There are words that many people stumble over when tidying up.
"Still usable."

Indeed, it's hard to throw away things that are still usable. However, keeping things you don't use isn't necessarily the right answer. Even if something is still usable, if you're not using it, it has lost its role in your home.

Rather, letting go while it's still usable increases the chances of it being useful to someone else. If it's clothing, it can be donated or passed on while in good condition. If it's a book, it can reach someone who wants to read it. If it's a daily necessity, it might go to someone who needs it.

Of course, you don't have to force yourself to let go of everything. There are sentimental items, cherished gifts, disaster preparedness supplies, seasonal items, and tools that are necessary even if used infrequently. Tidying isn't a competition to throw everything away.

What's important is to look at whether "it's usable" or "you're using it" and whether having it improves your life.

If the answer is unclear, you can create a temporary hold box. However, set a deadline. One month, three months, until the season changes. If you haven't taken it out once during that period, it's likely not necessary for your current life.

For those who already have a lot of things, start by deciding on a "small area"

"One in, One out" is effective in preventing things from continuing to increase. However, if storage is already beyond its limit, this rule alone may not be enough.

In that case, it's good to first decide on one small area. Not the entire closet, but just the right end of the hangers. Not the entire cupboard, but just the shelf for mugs. Not the entire bookshelf, but just one row of read books.

Tidying failures often start from trying to cover too wide an area. Attempting to do the entire room, pulling everything out, getting tired halfway, and ending up with a messier state than before. Large-scale before-and-after transformations that look good on social media are appealing, but in real life, small completion experiences are easier to continue.

For those who want momentum in tidying, there's also a method of making the contents of storage visible by taking everything out once. Real Simple introduces the "Chaos Method," where you empty drawers or shelves, gather the contents, and quickly sort them. The idea is that by putting everything in front of you, you can more easily notice duplicate items or things you forgot about.

However, this method is not for everyone. Some people may feel overwhelmed when faced with a large pile of items. Therefore, it's safer to start with a size that allows you to stop halfway, like one drawer, under the bathroom sink, or a corner of the shoe cabinet.

What makes tidying enjoyable is not storage goods, but the "sense of progress"

The moment tidying becomes enjoyable isn't when you buy storage goods.
It's when you change the space a little with your own hands.

When one piece of clothing is reduced, hangers become easier to move.
When there's space on the bookshelf, spines are easier to see.
When old samples disappear from the bathroom drawer, morning preparations speed up.
When you can quickly find the lids for kitchen storage containers.
When the paper bag left at the entrance disappears.

These small changes surprisingly affect your mood.

A messy room becomes visual noise. Every time you see it, it reminds you, "I have to tidy that up." Storage with too many things interferes with daily small actions. Taking out, putting back, searching, choosing. These gradually become a hassle.

Conversely, when the amount of things matches you, daily actions become lighter. You know where everything is. There's a place to put things back. Before buying something new, you can remember what you already have. This also leads to savings.

People who feel "tidying is fun" often didn't like tidying from the start. They continue because they have a sense of progress, a sense of their life being organized, and a sense of re-choosing for themselves.

Ask one question before shopping

To make this rule even more effective, ask yourself this before buying.

"If I bring this in, what will I take out?"

If an answer comes to mind quickly, that purchase might fit your current life.
If no answer comes to mind, you might already have enough.

This question isn't just for restraint. Rather, it's a question to choose what's truly necessary for you.

Because it's on sale, because it's trendy, because you saw it on social media, because you want free shipping. Items bought for such reasons might make you happy the moment they arrive, but they tend to lose their presence in storage.

On the other hand, items you think "I can let go of that to welcome this" have a high priority for your current self. Shopping satisfaction also increases.

Tidying isn't just a task to reflect on past purchases. It's also practice for making better future purchases.

When living with family, start with "your own things"

Be careful not