This placard was likely intended to be mounted to external velcro loop on a body armor vest like a PBPV (source: https://gwotmuseum.wordpress.com/2019/10/26/pbpv-personal-ballistic-protective-vest/). This is similar to the panel made for tactical tailor MOLLE pouches.
Inside:
Elastic loops are likely for shotgun shells or glow sticks. The compartment could also be used to store documents.
Straps:
Pouch:
Sides:
Sides have been melted to prevent fraying.