Pack all of your heavy items in the bottom of your suitcase. Determine the bottom by the position of the suitcase when it is locked & either wheeled or carried.
Use travel sizes only for your cosmetic choices and place them in ziploc plastic bags.
Roll clothes rather than fold. Roll each item in plastic & then when it is removed you will have no wrinkles plus you can fit a lot more items rolled rather than folded.
Take a slip of paper, put your name, address and phone number on it and leave it INSIDE of your luggage.
HAPPY TRAILS TO YOU.