How long did you have to wait for those roots? That bag looks like about the size of pint deli tub? So It will support the cutting while it's callusing! Great!
I have air-layered very fat philos that tend to rot at the stem, so I stuck the bottom end out of a cut hole in quart tub and filled the tub with mix. And stuck the top container into another heavy pot so that the stick was not touching and was in the air. And waited like a month to be sure. And then finally repotted it hiding the bottom end.
