The photo shows pockets sewn from scratch in 2 layers of shielding fabric and sheathed on the outside and inside with a regular fabric.
zipper with two sliders for more convenient opening / closing in any direction. A sling tape is sewn along the edge, which will give you the opportunity to sew your pocket anywhere without touching the working plane of the pocket.
shown pocket sizes:
height 37cm width 42cm excluding tape for fixation.