ZIPAFILE® is a heavy duty Storage Bag with a reclosable zip closure. ZIPAFILE® is a great solution for organization of learning center materials and ideal for transporting reading and homework assignments while protecting the supplies from wear and tear. ZIPAFILE® is made of clear low density polyethylene, that is acid free and CPSIA Compliant. The zip closure is Blue.Special Shipping Information: This item ships separately from other items in your order. This item cannot ship to a P.O. Box. This item may be subject to additional processing days.