Black Diamond Demon Backpack Size Chart
  Small Medium Large
Torso Length (in) 15½-18½ 17½-20½ 19½-23½
Waist (in) 27-32 29-34 34-39
Capacity (cu in) 1953 2075 2197
Product Weight 2 lbs, 10 oz 2 lbs, 11 oz 2 lbs, 13 oz

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