The medium pouch can hold enough fasteners to finish any job. This pouch can be attached directly to the rig belt or attached to a larger pouch. Two will easily fit across the largest pouches. When the job is completed simply remove and empty the remaining fasteners, no more dumping out the whole rig.
These pouches also attach to the tool holder and work bag. When you need a lot of fastener choices this makes having the right ones handy when you need them.