A suitcase can reveal an unexpectedly interesting feature of the human mind. Some people pack only what they expect to use: a few outfits, comfortable shoes and perhaps one spare shirt. Others prepare for almost every possibility they can imagine.
They pack something for an unexpected dinner, another outfit in case the weather changes, extra shoes in case the first pair become uncomfortable and additional clothes because, as they often say, “you never know.”
There are practical reasons for packing too much. But psychology suggests that overpacking can sometimes reflect how people think about the future. The brain regularly imagines possible situations before they happen, allowing us to prepare for events that may or may not occur.
For someone who finds uncertainty uncomfortable, an extra outfit can therefore provide more than clothing. It can provide a sense of preparedness.
Prospection
Psychologists Daniel Schacter, Donna Addis and Karl Szpunar have studied how people mentally construct possible future events.
This ability is often discussed as episodic future thinking or prospection. Instead of simply waiting to see what happens, the mind can combine memories, knowledge and expectations to create simulations of events that have not happened yet.
Prospection can involve planning, imagining possible experiences and anticipating how future situations might feel.
Packing a suitcase provides a simple everyday example.
A traveler may wonder:
What if it gets cold?
What if we go somewhere formal?
What if my shoes become uncomfortable?
What if I spill something on my clothes?
Each possibility can lead to another packing decision. Gradually, the suitcase becomes a physical response to several imagined versions of the future.
Simulation
Research suggests that mental simulation can influence behaviour. A systematic review and meta-analysis covering 123 studies and more than 5,600 participants found a positive overall effect of mental simulation on behaviour, although the effects varied according to the type and purpose of the simulation.
This provides one possible explanation for why people sometimes pack for situations that are unlikely to occur.
They may not simply be filling their luggage without thinking. Instead, they are responding to possibilities their minds have generated.
Consider someone travelling for three days. They expect to spend most of the time sightseeing casually. Then they imagine receiving an invitation to an elegant restaurant.
A formal outfit goes into the suitcase.
They then consider rain. Another pair of shoes and an umbrella seem useful. Later, they imagine a cold evening and add a sweater.
The packing process has become a form of preparation for several hypothetical futures.
Uncertainty
Another relevant concept is intolerance of uncertainty.
Researchers including Michel Dugas, Naomi Koerner and Mark Freeston have examined individual differences in how people respond to uncertain situations. Contemporary research treats intolerance of uncertainty as a psychological construct that can occur across different situations rather than belonging to one specific condition.
For someone who finds uncertainty particularly uncomfortable, preparation may provide reassurance.
The thought process can be as simple as: “I probably will not need this, but what if I do?”
That final question can be enough to keep an item in the suitcase.
The extra clothes may never be worn, but having them available removes one small unknown. The traveler knows there is an option if plans change.
This does not necessarily mean the person expects something bad to happen. They may simply prefer knowing that they have a response ready if circumstances change.
Preparedness
Overpacking can also resemble anticipatory coping, where people take action before a potential stressor occurs.
The logic is straightforward. If an unexpected situation happens, preparation may reduce its consequences.
Someone who packs three additional outfits may never wear two of them. Yet the psychological benefit can occur before the journey starts. Once everything is packed, the person may feel more confident that they can handle changes in plans.
The clothes have become a form of perceived preparedness.
This distinction matters. The behaviour may be less about expecting problems and more about avoiding the feeling of being caught without a suitable option.
Memory
Future thinking is closely connected to past experience.
The brain does not construct imagined futures from nothing. It draws on memories and other stored information. Schacter and colleagues’ Constructive Episodic Simulation Hypothesis proposes that details from episodic memory can be flexibly recombined when people imagine possible future events.
Past experiences can therefore influence packing habits.
Someone whose clothes were soaked during a previous trip may always bring a spare outfit.
A traveler who once attended an unexpectedly formal dinner may routinely pack something more elegant.
Someone who experienced an unusually cold spell may add an extra sweater to every future suitcase.
The past becomes material for imagining what might happen next.
Choices
Overpacking can also provide a sense of choice.
Having more clothes means having more possible combinations. That can feel reassuring when someone is unsure how they will feel or what they will want to wear later.
The person may be thinking:
What if I do not want to wear jeans?
What if I want something more comfortable?
What if our plans change?
In this situation, the person is not only predicting external events. They are also predicting their own future preferences.
The suitcase effectively protects the future self from having too few options.
Limits
It is important not to treat overpacking as evidence of a psychological problem.
People pack more for many ordinary reasons. They may enjoy having choices, have enough luggage space, dislike doing laundry while travelling or simply prefer to be prepared.
Overpacking by itself does not demonstrate anxiety or intolerance of uncertainty.
The psychological interpretation becomes more relevant when packing is accompanied by persistent “what if” thinking. For example, someone might repeatedly imagine unlikely situations and feel significant discomfort about leaving an item behind.
Research has associated intolerance of uncertainty with worry and difficulties in emotional regulation, but that does not mean every preparation habit reflects a mental health condition.
Balance
Preparation itself is useful. The ability to imagine possible events helps people plan, make decisions and avoid foreseeable problems.
The more interesting question is where preparation ends and overpreparation begins.
Packing one additional shirt because plans could change is ordinary. Packing an almost complete second wardrobe because dozens of unlikely scenarios have been imagined may suggest that uncertainty is playing a larger role in the decision.
In the first case, the suitcase reflects what the trip is likely to require. In the second, it may reflect what every imaginable version of the trip could require.
Future
Packing far more clothes than necessary can sometimes offer a small glimpse into how someone approaches the future.
The person may be mentally simulating different possibilities, drawing on previous experiences and taking practical steps to make uncertainty easier to manage.
The extra sweater, second pair of shoes or formal outfit may never be used. But they may still serve a psychological purpose before the journey begins.
They can represent a simple message to the future self: “Whatever happens, I have an option.”
That may help explain why some people find it difficult to remove those “just in case” items before finally closing the suitcase. The clothes are not necessarily there because they will be needed. They may be there because imagining a future without them feels less comfortable.
FAQs
Why do some people overpack?
They may want more choices or feel better prepared for uncertainty.
Can overpacking be linked to anxiety?
It can sometimes relate to discomfort with uncertainty.
What is future thinking?
It is the mental process of imagining possible future events.
Does past experience affect packing?
Yes, past events can influence what people prepare for.
Is overpacking always a problem?
No, overpacking can have many ordinary and practical explanations.
