Okay, I understand the directions for the Candy Stripers: felted messenger and laptop bags
in Stitch n' Bitch Nation
until it gets to this part in the horizontal herringbone stitch pattern:
Row 2: *P2tog, then purl first st again, slipping both sts off needle tog; rep from * to end.
I checked YouTube videos and they say nothing about the purling part of herringbone.