Hi there, ES10 lover fellows! ;-)
Haven't been around for a while, and just wanted to share a few thoughts on our beloved ES10.
After almost 6 months of unsuccessful attemps to source AHH-HPP5 to carry around ES10, RSA Predator USB DAC/Amp, cables etc., I started to look at third-party alternatives. And I have recently got what I think is as close to perfect as I could have found: Pioneer HDJ-HC01. Here are some pics for your reference.
The case itself is very good quality. Hard shell gives nice protection, soft inner padding is giving due care to components inside.
You can see that it's a near-perfect fit for ES10, even with cups extended, which I like a lot, as I don't have to contract them all the way every time for storage. RSA Predator is sitting atop Xperia Sola (used as a portable source). I have a small separate pouch for the Sola/Predator combo, not shown here. It fits right inside the headband, so items are not all over the place when on the go.
There's a convenient removable zipper pouch (velcro attached) holds smaller accessories (could be a tad bigger to my taste).
So if you're looking for a nice carry case for ES10 - put this one on the list :-)