From book:  "Skill level: Intermediate.  Don't let the festive look of the eyelash yarn fool you - this is one sturdy bag.  The first few rounds are crocheted with a smaller hook so the stitches are tight, eliminating the need for lining and resulting in self-supporting sides with minimal slouching.  So load it up, this bag can take it."

Gauge is calculated holding a strand of each type of yarn together.