Extra socks and underwear
Socks and underwear can take up vital storage space. You’ll probably only need about three pairs of each as long as you are prepared to wash them regularly. They tend to dry pretty quickly, especially those made from quick-drying fabrics, so you can save room in your pack by only bringing the bare essentials and then committing to washing your small items regularly.
Packing less doesn’t mean you have to go around without any comfort, it just means that you leave room for what is really essential for your trip and the rest will be at home waiting for when you get back. You’ll save yourself time, money and energy by carrying less around with you so give it a try!