Quality Park 11 x 13 Poly Expansion Mailers have 2 inch expanding sides to make room for big, bulky items. These jumbo poly envelopes are perfect for shipping non-fragile items and soft goods. Made of lightweight recycled polyethylene to keep shipping costs down. Send multiple small orders in one bag to save costs! Remove the easy-to-use peelable paper strip and press for a permanent seal. 100 Per box. Jumbo 11 x 13 Poly Mailers. 2" Expanding sides. Self sealing. White. 12" x 15-1/2". 2" 100 Per box. IDEAL FOR ONLINE SALES: Boxes of 100 keep you stocked and ready for more orders. Perfect for online selling and small businesses! ECONOMICAL SHIPPING: Lightweight poly bags add little to your shipping costs while packing multiple orders in one bag. PRESS TO SEAL: Redi-Strip closures save time and increase efficiency. Simply peel and press, no moisture required. BETTER THAN BOX TRAVEL: Durable, puncture-resistant polyethylene holds up through days and weeks of shipping—no broken-open boxes or dents. SHIPPING APPROVED: Suitable for UPS, USPS, DHL, Royal Mail, Japan Post Service and other carriers.