North Face Women's Casimir 36 Backpack Size Chart
  Small/Med Med/Large
Torso Fit Range (in) 15-20" 17-22"
Chest (in) 33-37" 35½-39½"
Waist (in) 25-29" 27½-32"
Capacity (cubic in) 2197 2197
Product Weight 2.2 lbs 2.25 lbs

These are general guidelines only, sizes are not guaranteed. But no worries, since at SunnySports we offer our exclusive PFF Guaranty