No. 10 cotton thread with 1.7mm hook. The rectangular crocheted piece was too narrow for the length of a packet of tissue so I turned it 90 degrees instead and added the triple crochet/double crochet borders. The case opening is perpendicular to the opening of the tissue packet inside but still works. Rachel is using it for school now.
Working with thread is a much slower affair than dk or aran weight yarn.