Victoria wrote an answer about Osprey Packs Talon 11 Backpack - 600-700cu in on December 8, 2011
Actually, for the Talon 11, the S/M and M/L sizes are not based on Torso height. According to the company's website, the difference is carrying capacity.
Size cu. in.
Dimensions for both: 19.5 x 11 x 7