Very good question, I first want to say the Helix is not replacing the Catalyst. The Catalyst still remains are smaller backpack bag. However if you purchased the Catalyst during the preorder period you can purchase a Helix for $150 shipped. This is more of a loyalty discount. I see what you are saying as far as the Ergo 1 to Ergo 2. The Helix is not going to be a modified Catalyst it is going to be a whole new bag.
Scott,
Is the 150 price available at anytime for the Helix or do you have to purchase it by a specific date?