EXCELLENT MATERIALPack of 100 adhesive-closed plastic pockets which are stronger than conventional envelopes, the polyethylene plastic film of these tear-proof envelopes gives them superior resistance to humidity and tearing.plastic adhesive-closed pockets which are stronger than classic envelopes. . ATTRIBUTESIZE SIZE SHIPPING PACKAGING POUCH - 30 42 cm / 11.8 x 17, it can load most books, clothes, Christmas gifts, candy bags and various non-fragile products. SHIPPING BAGS OPENING LENGTH 4.8cm/1.9, a sealing strip with super strong adhesion, which cannot be opened easily after sealing, ensuring safety. . PERFECT FEATURESPackage envelope is waterproof, tearproof, good toughness, not easy to break. Can bear a weight of 3-4 kg. Pouches made of 100% recyclable plastic that is harmless to the environment when incinerated (no release of toxic gases). . STRONG TEAR RESISTANCEPlastic film of the pouches in 60 thickness and reinforced welds to avoid the risk of bursting. Lightweight mailing pouch for reduced postage costs. . PRIVACY PROTECTIONMade of an opaque black plastic film on the inside for confidentiality and glossy white on the outside, the postal envelope ensures easy writing, perfect adhesion of the shipping labels and a rewarding presentation your mailings. .