Gregory Jade 38 Backpack Size Chart
  Small Medium
Torso Length (in) 16-18 18-20
Capacity (cu in) 2258 2380
Product Weight 3 lbs, 2 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