The mistake is packing for destinations; the fix is packing for temperatures. Build around three layers you can combine — a breathable base, an insulating mid-layer, and a light shell — and you can dress for a frosty mountain dawn and a warm harbour lunch out of the same carry-on. Everything should share a palette so any top works with any bottom.
Choose fabrics that earn their space. Merino wool base layers regulate temperature and resist odour, so you re-wear rather than repack; a packable down or synthetic mid-layer crushes to nothing; a shell handles both wind and rain. Two pairs of shoes at most — one you can walk ten kilometres in, one you would happily wear to dinner.
Finally, respect the liquids and the laundry. A 100ml decant kit and one small bar of solid soap covers most needs, and a two-minute sink wash every few days means you pack for a week regardless of trip length. The reward is real: no checked bag, no carousel, and the freedom to change plans on a whim.
