For anyone browsing Malachain, 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.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.
It also helps to talk the subject through with friends or colleagues who have tried something similar. Their experience points out the details that guides leave out: how long things really take, which costs were unexpected, and which shortcuts turned out to be a mistake.