Use the proper packing material when filling your suitcase

As friction is what causes wrinkles, plastic, which reduces friction, is your friend. Put individual items inside dry-cleaner bags and they’ll arrive in a perfectly preserved state. Resealable plastic bags are good for stowing miscellaneous items. Inexpensive nylon-mesh laundry bags are great for delicates. Not only will this keep them safe and clean, if your bag is inspected, no one need touch your undies since an inspector will be able to see into the bag.