Side load polypropylene envelopes provide safe storage for your documents. Made from acid-free polypropylene, with string closure. For 11 x 8 1/2 document storage. Sold as a pack of 24 in assorted Tropic Tones: Seaside Blue, Sunny Yellow, Seafoam Green, Sunset Red, Sandy Gray and Clear (no color choice). Made from acid-free polypropylene, with string closure. For 11 x 8 1/2 document storage. Sold as a pack of 24 in assorted Tropic Tones colors include Seaside Blue, Sunny Yellow, Seafoam Green, Sunset Red, Sandy Gray and Clear. Age: 4+ years/Grade PK+