Grey Postage Mailing Bags Strong Cheap Plastic Poly Postal Self Seal Parcel Size
WATERPROOF AND TAMPERPROOF. LIGHTWEIGHT BUT VERY STRONG. 5 x 7 " (120mm x 170mm) X Small. 6 x 9 " (165mm x 230mm) Small. 10 x 14 " (250mm x 350mm) Large. 12 x 16 " (300mm x 400mm) X Large.