Ditto the Sportube. Years ago on a Delta flight to Salt Lake City, something slit my ski bag, causing damage to the bases and edges. Ever since, I have used Sportubes.
Did I ever post how I packed a soft ski bag? If I did, just ignore this.
I was taking a pair of skis to Germany to leave at my friend's house. I calculated that if I carried an extra bag ($100 fee) over and back ($100 fee) each year we ski in Austria, I might as well well get a new pair of skis for here and leave my old ones there. I had a small ski bag that folds, so I could get the little bag back to the US in the regular suitcase without an extra bag charge.
However, I am so afraid that something will poke into the fabric of the ski bag and damage my skis, I packed it like this.
I wrapped the tips and tails in cardboard and heavy brown Kraft paper.
I taped the poles to the sides of the skis and placed the grips under the cardboard tip protection.
I compressed and rolled some jackets, layers and pants, wrapped them in a packing stretch wrap film and protected the bindings in the soft bag. Another layer of stretch wrap around the entire bundle (not shown) created a tight package. It would have been hard to break through the layers of plastic and clothing.
I wore my heaviest ski jacket to the plane. I stuffed my electronics/computer, boots, goggles, helmet, base layers and socks, shell pants, and an extra daytime outfit in my Transpack boot bag. I could ski if the checked bag or skibag was lost. I did check a bag, as I was staying in Europe for a few weeks after our weeklong ski trip and needed some extra stuff.