Back Strap
It's pretty simple: if you have a Spiritus chest rig, you're going to need this. The Back Strap provides the retention necessary to keep the Chassis
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This violet decorative edge strap elastic has a green plush back and green stitch lines on it. This measures 14mm wide, so 5/8 hardware fits this
Violet and Green Plush Back Strap Elastic - 5/8 inch or 14mm - 5 Yards
Split Chest Protector Back Strap Kit – O'NEAL