The Mares XR Mask Pocket is designed to hold a backup masks and can also be used as a utility pocket to hold a handheld light or a small SMB and finger spool. The back of the pocket has a loop for vertical mounting on {2 in | 5 cm} harness webbing and is 1200 Denier ballistic nylon reinforced with polyurethane and the front is an expanding polyester mesh for instant drainage and drying. The flap is embroidered with Mares XR logo and closes with a { 1.2 in | 3 cm } plastic slide-release buckle on an adjustable length nylon webbing strap. The flat dimensions are { L x W | 10 x 4 in | 25 x 10 cm } and expands to hold a volume approximately {L x W x D | 8 x 4 x 3 in | 20 x 10 x 7 cm } in size.