Halcyon bellows suit pocket, larger size than regular version.  Sold as a single pocket.

Halcyon pockets add a critical level of functionality to your wet or dry suit, allowing readily accessible storage of utility and emergency items. Our heavy-duty pockets provide plenty of room for your spare Halcyon mask, your Stainless Steel bolt snaps, your favorite Defender spools, or any dive accessory you need to carry.

•     Constructed from 1000-denier nylon with hook and loop style closure flap
•     Two internal shock-cord loops for attaching accessories
•     Drain holes secured by SS grommets
•     Zip closure compartment for small accessories; small pocket contains two shock-cord loops
•     Internal pocket for Halcyon diver's notebook
•     Easily mounted on your wet or dry suit

Two styles of Halcyon Pockets are available:

1.    The Bellows Pocket offers 168 cubic inches (2.75 liters) of cargo space and is 7.25-in. x 11.50-in. x 1.76-in. (184.5mm x 292mm x 44.5mm)
 2.   The Exploration Pocket (BAP) offers 186 cubic inches (3.05 liters) of space for divers that require extra accessories and is 8-in. x 11.5-in. x 2-in. (203mm x 292mm x 51mm)