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Every trip decides which of the six tests it cares about

Photo: Vlada Karpovich on Pexels

Five shapes a trip can take

Trips

The 6 tests do not change from trip to trip. What changes is which of them decides the outcome. One night away barely notices the gate frame and cares enormously about the front door. A fortnight with a checked bag cares about a belt and a scale that a weekend never meets.

One night

One Night Away

Out on Tuesday, back on Wednesday

One night is the shortest trip that still needs a bag, and it is the trip where almost anything works. A change of clothes, a wash bag, a charger. It fits in a daypack, it fits in a small duffel, and it would fit in a cabin case with room left over.

Where it lets you down

  • The Front Door
  • The Hotel Room

Punishes:Bringing structure you do not need. A rigid shell earns its keep by protecting things over distance, and one night is not a distance.

Three nights

The Long Weekend

Thursday night to Sunday evening

Three nights is the sweet spot for a cabin bag and the point at which the bag stops being incidental. You need more than one change of clothes, probably a second pair of shoes, and something for whatever the reason for the weekend was.

Where it lets you down

  • The Gate Sizer
  • The Overhead Bin

Punishes:Using the expansion outbound. Once it is open it rarely closes again, and the size the bag was chosen for stops applying.

Fourteen nights

Two Weeks, Checked

A long trip with a bag in the hold

Two weeks is the point at which a checked bag stops being optional for most people, and the whole shape of the problem changes. The bag is no longer something you carry; it is something you hand over and then hope about.

Where it lets you down

  • The Front Door
  • The Baggage Belt
  • The Hotel Room

Punishes:Buying the largest case available. Volume runs out slowly and the weight allowance runs out quickly, so a bigger case usually means reaching the limit half empty.

Any length

One Bag Only

Everything in the cabin, nothing in the hold

One-bag travel is a discipline rather than a trip length. The rule is simple: whatever you are bringing goes in the cabin, and nothing goes in the hold. People do it for a weekend and people do it for a month.

Where it lets you down

  • The Gate Sizer
  • The Front Door

Punishes:Using the expansion. A pack that expands by six liters is deeper than the pack that was described as a personal item, and depth is what runs out first.

A week or more

Family With Children

Several bags, several people, one queue

A family trip is not one packing problem scaled up. It is several packing problems that have to be carried simultaneously by fewer people than there are bags, through a building designed for adults with one hand free.

Where it lets you down

  • The Front Door
  • The Hotel Room
  • The Overhead Bin

Punishes:Matching sets bought on looks. A set is two empty weights, and neither of them is stated.