While tying a double loop from ABOK last night, I got a little side tracked, thought I knew what to do next, and ended up with this. As you can see in the image with the loops together, it looks just like an Eskimo Bowline, but on a bight. After some time, I did figure out how to tie it on a bight, its actually not hard, but I didn't take pictures. I can post directions/pictures if anyone is interested. Tying it with an end is straight forward enough though.
The two loops communicate readily (if you pull one, that one lengthens while the other shortens) when the loops are splayed, but when pulled tight, the loops come together and lock.
I looked through ABOK, then online, and don't see much, even on the eskimo bowline. Anyone know anything? I feel like I must be missing it, it just seems too basic not to be out there.