20 EcoSwift Size #4 10 x 13 White Poly Mailers Self Sealing Bulk Packaging Materials Shipping Supplies Envelopes Bags 10 inches by 13 inches Size: #4 Dimensions: 10" x 13" Dimensions: 10" x 13" EcoSwift Self-Sealing, Peel and Stick Adhesive Quantity: 20