The mask pocket is for the spare mask. Two loops allow you to place it on the waist belt and use it as an additional pocket.
The most important features of the mask pocket:
• 1200d ballistic nylon
• 600d polyester weave
• Collapsible, wide and expandable
• Black polyurethane internal reinforcement
• 1 oversized clip
• Long nylon strap that allows the pocket to be fully opened
• Large nylon eyelet can be placed on the belly strap