Again this was a prototype that I saw. So I don’t want to share too much as it isn’t my place to share. But the fabric was different (significantly lighter in weight) but appears very durable. The lumbar pad and shoulder straps appear similar in design but with different fabrics surrounding them. The back frame portion also has a different material and design. I like that everything is interchangeable with the current bags. Again, I don’t want to share too much as I think Steve and his crew deserve to share what they want. But overall, I will tell you, it can’t be released soon enough as I was BEYOND impressed! It wouldn’t matter what the price was for me, it was that nice to me.