Tamrac SPX-787, MAS Extra Large Padded Extreme Series Backpack Pockets, Set of Two, Black.

For additional storage space for the larger Extreme Series and Expedition Series backpacks these foam padded side pockets make the perfect accessory. They have two way zippers beneath a storm flap for fast access, and will hold lenses, extra equipment, or personal items within easy reach. Large mesh exterior pockets provide easy access to maps and small items while on the move. They use the Modular Accessory Attachment System to fasten securely to the sides of Extreme Series