There is also an external slot that can hold either, a standard pen, the detached antenna, or a glass-rod fuel gauge.
In addition, the top "cover flap" of the Side Pocket Alpha is adjustable (and removable) to allow it to go up "over" and secure tall items like a tall bottle or a compact umbrella. And the Velcro tab is now "extra wide" to provide good "grip" when the expansion zipper is opened for wider objects.
NOTE: This side pocket will not mount on the CS2 or CS3 because these modules do not have FLEX Mount Side Pocket Stations. Only the CS4, CS5, and CS11 can accept Side Pockets.