Rust-preventive Vapor Corrosion Inhibitor (VCI) infused into resin and foam emitter Ventilated foam surrounds firearm(s) with 360 degrees of rust-blocking protection Blocks rust/corrosion 5x longer than competing products (per accelerated lab testing) Pressure release valve equalizes pressure caused by altitude or temperature changes Pre-perforated pluck foam for easy customization Dual-stage lockable latches