Of all the ZP fabrics Triathlon's are one of the easier to pack. I just pro-pack, don't roll the nose and just roll the tail enough to control the pack and it opens nice and soft, and on heading most of the time. Its a great canopy, it flies fast enough to penetrate the wind, and yet is forgiving enough to allow for mistakes. I really love mine.
The ZP Fabric used to build Triathlons is different from the ZP by PD or Icarus. Its not as slippery feeling and makes it quite easy to pack. I had very few problems learning how to pack with mine. If you goto the Aerodyne website, they go into more detail about the material and why it packs easier