Take clothes you don't have to iron. Wear bulky clothes on a trip - saves space in your suitcase.
Make a list of everything you need. When packing, you will simply remove them from the list. It should contain adapters, chargers, toiletries and medications, and of course, clothes.
Before packing, unwrap all the clothes to get rid of the ones that look pretty much the same.
Copenhagen Airport on the map
Flights to Copenhagen
List of popular destinations with flights arriving at Copenhagen airports