It’s been more years than I realize probably but bambino and a few other diaper manufacturers used a channel pattern. I believe it’s around the time fabine originally came out. They also used to perforated top sheet. I think a few still do this. Anyhow, they had more sap down the center then on each side. This was centered in the crotch area, where most of the sap is now. It allowed to an extent, for the swelling to be a little more effective and comfortable between your legs. They did this for a while, then just stopped. Of course I’m not even sure fabine is in business any longer. If I recall, crinkles original design was similar to this, definitely different than what it is now. I personally think that rearz, abu, and a few other companies several years ago absorbed much better, then switched to more sap and functionality went down, and now going back up again with various “mega” diapers. I did think just the other day how well pampers and ninjamas absorb, for what they’re designed to, and how it would be interesting to see this specific function in adult diapers. Then I see this post. Funny stuff!