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Premium 180gsm Kraft Paper & Expandable Structure: Crafted from thick 180gsm kraft paper, these envelopes are tear resistant and wear proof. Expandable sides stretch up to 4.1cm, easily holding thick stacks, magazines, catalogs and bulky paperwork without tearing or bulging. Convenient Self-Seal Adhesive Strip: Built with strong self-adhesive closure for fast, secure sealing. No water licking or extra glue required, saving time while keeping inner items tightly enclosed and well protected during delivery. Large Dimension & High Capacity: Measuring 23.7x33cm, these expandable envelopes can hold more than 200 sheets of paper. Firm sealing keeps contents intact, avoids leakage and ensures tamper-proof protection in transit. Multi-Scenario Application: Perfect for mailing, sorting and storage of photos, papers, files and archives. Well suited for daily use at home, school, workplace and business office to meet various filing and postal needs. Classic Kraft Appearance & Easy Marking: Natural brown kraft finish delivers a neat professional look. Blank surface supports simple labeling and writing, helping you classify and identify files quickly for tidy organization.