Packing Technique
Pack tightly. Loose clothes will wrinkle. But don't cram the suitcase so tightly you have trouble closing it. (You don't want to have a zipper or hinge break on the trip.) Also don't pack a bag so heavily that you can't carry it.

Roll things instead of neatly folding. It takes up less space and clothes will resist wrinkling.

Tuck ties in your jacket pockets.

Belts aren't rolled up but laid around the inner edge of the bag.

If you have something that absolutely must not wrinkle, hang it in its own cellophane bag, with the arms crossed across the breast. Fold it as few times as possible.

Toiletries: Should be travel size. When flying, don't fill the bottles to the top, because the pressure may cause contents to expand. Pack bottles in plastic bags in case of leakage. Try a small hanging toiletry bag with pockets. These are handy to hang on a towel rack and they are great for your medicine and miscellaneous items (bandages, corn pads, extra contact lenses and so on). If you can fit your toiletries in your carry-on, try to put them in an easily accessible compartment.

If your bag has a space for hanging clothes, use metal hangers. Keep the outfits together in dry-cleaning bags.