Use a padded ski or snowboard bag. Any padded bag you own works. No bag? Ship4Snow sells a $20 Ski Box and Snowboard Box.
Your first price uses a standard packed size for Skis, Snowboard, or Ski & Boot Bag. If your bag is longer or heavier than that, choose Enter my size on the quote page and enter the packed weight in pounds, so the label matches the bag you hand to the carrier.
Claims can be denied if the skis or snowboard were not packed this way. A photo of the packed bag, taken before you seal it, helps if you ever need to file a claim.