The trick to a week in a carry-on isn't packing less, it's packing things that combine. A 7-day trip realistically needs about 4-5 tops, 2-3 bottoms, and one layer that can be worn on travel days to save luggage space entirely.
Pick a single color story - even two neutrals plus one accent color - so every top works with every bottom. That alone usually cuts a packing list by a third without cutting outfits.
Toiletries are where people overpack out of habit. Travel-size everything, and skip duplicates of things the hotel almost certainly already provides. What's left should fit in a single quart-size bag with room to spare.
