Large Poly Mailers Bags are Large and strong enough for bulk packing, suitable for packing light and big products,such as clothes,bag,shoe box,big doll,slim blankets,down jacket,etc. Strong Adhesive Self Sealing Mailers:Each large mailing envelope contains a strong adhesive self-sealing strip. Prevents your items from being secretly replaced during transportation,simply peel and fold over to seal each package safely and securely Waterproof Mailing Envelope:Craft with premium material, no easy punctured and damaged. Design with reinforce sealing on the edge, Our mailers poly bags tear-resistant and waterproof. Even in foggy or rainy days, your parcel will safe for shipping