Perfect Size for Bulk Shipping: Get 100pcs of high-quality, opaque bubble mailers, each measuring 6x9 inch (18x23cm) with a 1.57-inch (4cm) adhesive opening. The bulk pack saves costs and meets high-volume needs, whether for home, office, or e-commerce Durable & Waterproof Bubble Mailers: Made from PE material, these padded envelopes are puncture-proof, waterproof, and weather-resistant, ensuring your items stay safe in rain, snow, or rough handling. No extra packaging needed—just seal and ship Tamper-Proof Self-Seal Design: The ​strong self-adhesive strip creates a secure, tamper-evident seal. Peel, fold, and press—no tape required. The ​all-season adhesive stays strong in heat or cold, preventing accidental openings or theft during transit Opaque Bubble Poly Mailers: Inside, full-coverage air cushion bubbles protect fragile items (like jewelry, cosmetics, or electronics) from impact damage. The opaque matte outer layer keeps contents invisible—even in bright light—for discreet shipping of sensitive goods Lightweight & Versatile: These lightweight yet sturdy shipping envelopes are perfect for packing a wide range of products, including clothes, books, magazines, cards, jewelry, cosmetics, and photographs. Ideal for home, office, business, shops, and online retailers, they bring convenience and reliability to your packaging needs Opaque Waterproof Lightweight Mailing Shipping Bags Bulk for Thick Books Clothes Makeup Jewelry Small Business