A good travel kit contains the items you actually use, packed in a way that makes them easy to find. A few reliable products can make an unfamiliar place feel more comfortable.
Plan around the trip
Consider the length of your stay, the climate and any transport restrictions. Decant products only into clean, suitable containers and label them clearly. Keep medicines and essential items according to their specific instructions.
Prevent spills and surprises
Close lids firmly and separate liquids from items that could be damaged. Bring sunscreen if you will spend time outdoors. Avoid testing several unfamiliar products at once when traveling, particularly if your skin is easily irritated.
Check before you leave
Look up the current liquid rules for your route and carrier rather than assuming they are the same everywhere. Keep any essential medication in its original packaging when required and allow space for a small leak-proof bag.