Packing for a week in one carry-on bag
For anyone browsing Crazish, here is a clear starting point on the subject.
A week of clothes fits in a small bag if everything matches everything else. Choose one colour family, pack three tops and two bottoms that all combine, one warm layer and one pair of shoes besides the ones you wear. Roll clothes rather than fold them and use a packing cube to keep the bag organised when you live out of it in a hotel room.
Toiletries shrink fastest: decant into small bottles, carry a bar of soap instead of gel, and buy anything you run out of locally. Leave the "just in case" items at home; in most places you can buy an umbrella or a charger in ten minutes. Travelling light saves checked-bag fees, lets you walk from the station instead of queueing for a taxi, and makes every connection calmer.