Shoulder Saver Backpack Tubes

I inquired approximately a year ago on purchasing separately the Chestnut Backpack Tubes and was told that Saddleback was not going to sell just parts. I was disappointed at the time... but I am over joyed that there was a change of heart. I use the Chestnut backpack tubes for my Chestnut Love 41 Universal Backpack... which has saved my shoulders from a lot of pain as the bag is heavy when I have it loaded down with all my work stuff! They are still a little stiff.., but they will break-in beautifully in time. Plus, they are a perfect match! Love, Love, Love my Tubes. Truly, Christine