Packing a suitcase is an exercise in restraint. There’s always more you can take on a journey than you will need.

Balance is the thing. The comfort of carrying little versus the assurance of having everything you want with you.

Picturing yourself walking out into the city you are visiting or countryside to explore helps.

I find rigid rules do not work.
But some use a strict guideline and are happy with that.

Main thing is to enjoy the journey and be nourished by it. It is you, not your luggage that will be enriched by a new experience!