Economical and easy-to-use foam-in-bag system saves time. Protect fragile shipments with custom cushioning that expands and forms around contents. Bags require a 30 minute warm time. Must be used with warmer. Four simple steps: 1.Apply pressure to the "Press Here" area to open the inside seal.2.Pat parts (A) and (B) back and forth; bag will begin to expand.3.Place the expanding foam-filled bag in the carton and nestle the product onto the cushion.4.Follow steps one and two, and place second expanding bag on top of product to form top cushion.