You have to take the Aeronaut off to get to the lower pocket in backpack mode. You can however "get at" the top zippered side pocket by taking off Right backpack strap and accessing the pocket by sliding left strap down the arm.
PS I got some chocolate M&M's at Target...and it's all your fault Icebeng!
Enjoy the M&Ms! Unmashed I hope :p
llkyway, I'm waiting to see if the Aeronaut 30 is more suitable, the big Aeronaut is attractive, but may just be a little overwhelming for me if fully stuffed.