This pattern is double knit like a square, filled with dried lavender, and then seamed up into a pyramid shape.

Errata from Purl Soho customer service:
Redistribute sts as follows to prepare for finishing:
K7 from front needle onto Needle 1,
K8 from front needle onto Needle 2,
K7 from back needle onto Needle 2, (15 stitches total now on Needle 2)
Slip last 8 stitches purl wise from back needle onto Needle 3 (these stitches will not be knit)

Finishing: Fill sachet with lavender. Using the Right tip of Needle 1, Slip the 8 stitches from the Left tip of Needle 3 so stitches on Needles 1 and 2 end up parallel to each other, with the working yarn coming from the right tip of Needle 2. Use Kitchener st to graft close, leave a 10” tail.