Black Diamond Alias AvaLung Backpack Size Chart
  Small/Med Med/Large
Torso Length (in) 16-19 18½-21½
Waist (in) 26-40 28-45
Capacity (cu in) 1831 1939
Product Weight 3 lbs, 4 oz 3 lbs, 5 oz

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