The cellular cushioning materials described in this specification are intended for use within packages to protect items from damage due to shock, vibration, concentrated forces, contamination, and abrasion during handling and shipment. The transparent Class 1 material is especially suitable for use as cushioning inserts within transparent bags and envelopes. The transparency of Class 1 and Class 2 material permits inspection of the contents, without opening the package, for condition of humidity indicators. The flexibility of the material permits it to be used as pads, bags, wrap, dunnage, or filler. When maximum transparency is desired, the use of Class 1 or Class 2 material should be limited to one thickness. Class 2 and Class 3 materials are used to protect electronic devices which are sensitive to static charges. Class 3 material is used where fire retardant cushioning material is required.