Since they take so much space, it is ideal to place them in vacuum seal bags and take out the air to reduce their size so they can be placed in a much smaller shipping boxes. This will also cut on shipping costs.
You don’t have to spend on expensive vacuum seal bags for shipping. Bags made of thicker sheets of plastic will do as long as there are no holes on them.
Fold the towels and arrange them one on top of the other. Place them inside the bag, gather the plastic bag opening with one hand, insert the vacuum nozzle into the hole and let the vacuum suck the air out and minimize the bulk of the items. When done, just take out the nozzle and quickly twist the bag and secure with tape.
Place the vacuum packed towels into an appropriately-sized shipping box. Fill the remaining spaces with packing peanuts to prevent the contents from shifting. Close the box and seal securely with packing tape.
Address and label the box and take to your local post office of shipping company.