Quality Park Poly Mailers are the perfect jumbo envelopes for non-fragile items and soft goods. Made of recycled white polyethylene, these 12" x 15-1/2" bags are lightweight to help keep shipping costs low. Send multiple small orders in one bag to save costs. Remove the easy-to-use peel able paper strip and press for a permanent seal. Jumbo Poly Mailers. Self sealing. 12" x 15-1/2". 100 Per box. IDEAL FOR E-COMMERCE ORDERS: Boxes of 100 get you ready to ship to your online customers. Perfect for small businesses and online merchants! ECONOMICAL SHIPPING: Lightweight poly bags add little to your shipping costs while allowing you to pack lots in one bag. 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.