Expandable Ship-Lite® Envelopes are a durable, lightweight solution for shipping books and other bulky items, offering six times the strength of standard paper envelopes. Made from white paper reinforced with mesh screen poly fibers, these envelopes provide enhanced tear and puncture resistance while remaining moisture-resistant. The self-seal closure ensures secure packing, and their expandable sides make them versatile for larger contents. Ideal for items requiring extra protection, Ship-Lite® envelopes combine resilience with ease of use.