To answer Dlphin_Hunter's question:
Based on the CONOPS I have last seen, the plan is that, whenever they are expected to travel through the ice pack, the AOPS will normally embark a Coast Guard helicopter crew, including Ice Pic.
Otherwise, they are capable of embarking a RCAF Helo det of Cormorant or Cyclone as need be, but it is to be only when specifically required - not as a rule as it would be for the frigates, for instance.
This said, storage and handling of sonobuoy is straightforward and easy. Torpedoes are another matter. it's not enough to have them in a 20 ft container, you also have to have proper handling route and equipment along the whole route to permit their use, including, along the way, a proper space where the weapons tech can work as required on the torp, in a safe environment and with proper safety gear and measures in place: a torpedoe fuel leak can really mess up your day!