The Premier Soft Armor insert was designed for fitment inside the Second Zippered Compartment AND the Hydration/Armor Compartment of the FlatPack Plus providing multi-hit Level IIIA rated protection for defense against 9mm, .40, .45, .357 and .44 magnum (independently tested at muzzle velocity to the NIJ 0101.06 protocol). When paired with the FlatPack Plus, the Soft Armor Insert provides low profile, lightweight EDC protection perfect for everyday wear. Armor Inserts are TSA Approved for both checked and carryon luggage.