One bag because there is no time for a carousel

There is a settled way of talking about carrying only hand luggage. It is worth asking how much of it survives contact with the detail.

The wait lands where it hurts most

Time spent waiting for luggage falls immediately on arrival, which is the point at which a short trip is most time-poor. It also falls again before departure, when the alternative is a final hour somewhere you enjoyed.

On a two-week holiday those minutes disappear into the trip; on a two-night one they are a visible share of it. That proportional difference is the whole argument, and it does not depend on any charge.

Flexibility, not just speed

Carrying everything means you can change plans, take an earlier service, or walk from the arrival point rather than waiting for transport. It also means an unexpected delay is an inconvenience rather than a problem, because nothing is separated from you.

In practice, on a compressed trip that ability to adapt is worth more than it sounds. It is the difference between a plan that bends and one that breaks.

A separated bag is unrecoverable at this length

On a long trip, luggage delayed by a day is annoying and then resolved. On a two-night trip it means the entire trip happens without your things. Even where compensation exists, it does not return the weekend.

On an ordinary week, the exposure is small in probability and total in consequence, which is exactly when avoidance is worth it.

It changes how you move through the destination

A single manageable bag can be carried around for a few hours, which makes the arrival and departure days usable rather than dead. Anything that must be dropped off before you can do anything imposes a detour at both ends. On a short trip that detour is often an hour each way.

The size of the bag therefore determines the shape of the first and last day.

Where it does not apply

Travelling with small children, with specialist equipment or with medical supplies changes the calculation entirely. So does a trip with an event requiring specific clothing that cannot be compressed. The principle is to minimise separation and detours, not to follow a rule about bag counts.

The useful part is this: anyone for whom one bag is impractical can still apply the underlying logic.

Two nights is genuinely little

The volume required for two nights is small in a way people consistently overestimate. Almost everything beyond a change of clothes is carried for a contingency that a short trip does not have time to encounter.

The trip is over before most imagined scenarios could occur. That is the honest reason a short trip needs less, and it is specific to the length.

If that does not fit your week, it is not a failure of willpower.

Even a cabin bag can be taken from you

When a cabin fills, bags are collected at the gate and put in the hold, which reintroduces exactly the reclaim wait you organised the whole trip to avoid. Boarding position decides who this happens to, so the cheapest fare with the last boarding group is the one most likely to lose its bag on a full flight.

In practice, the defence is a bag small enough to go under the seat in front, which is never taken, and keeping whatever you actually need inside a smaller bag within the larger one. That inner bag also solves the separate irritation of leaving your documents, medication and charger in an overhead locker four rows behind where you are sitting.

The takeaway

The case for one bag on a short trip is time, not weight. Both ends of the trip get it back.

Pick the one that costs you least, and let the rest wait.