Destination wedding. You are flying in for 2 to 4 days. You want personal item only because you are doing excursions and a small bag is easier.
Possible but tight. Here is how to make it fit.
TL;DR Wedding trip in personal item only works for short trips (2 to 4 days), with a wrinkle-resistant dress, one pair of dress shoes worn on the plane, and normal rotation for the other days.
Carry-on only since 2014, I have done short destination weddings with personal item only. The constraint is short stays.
What fits in the personal item.
Wedding dress (wrinkle-resistant). 2 other outfits (one casual, one dressy-casual for welcome dinners).
Swim if relevant.
Toiletries.
Electronics.
About 22 to 30 liters of contents. Fits in a 17 x 13 x 8 inch bag.
What goes on your body.
Dress shoes on the plane (a flat or low heel, comfortable for travel). Heaviest jacket on the plane.
This is the key move. The dress shoes are too bulky to pack; worn, they disappear.
The dress treatment.
Roll loosely or fold along natural seams.
Place at the top of the bag.
On arrival, hang in a hot bathroom for 15 minutes.
Creases drop out.
Where it stops working.
Longer trips (5+ days).
Multiple formal events.
Structured ball gowns.
Heavy silk or taffeta.
For those, step up to a carry-on. The wedding-trip-carry-on article covers that case.
The system.
The 10-step Space-Saving Travel Packing Method I built over those 12+ years of traveling half the year scales down to short destination weddings with the same structure, just smaller numbers.
Short weddings fit a personal item. Wear the shoes. Steam the dress.
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Short weddings fit small bags. Wear the shoes, steam the dress, short days.
12-year nomad, carry-on-only traveler across 5 continents, and creator of Organizing.TV.
I help you pack smaller, stress less, and actually enjoy the packing part of travel.