Durability & Sturdiness:The strong stickiness prevents your packages from being tampered with during transportation, even in hot or cold weather.Please store these compostable padded shipping envelopes in a cool, dry places and avoid direct sunlight. Recyclable & Cushion: These 4x8 padded mailers are affordable alternative to shipping boxes, and they are lined with all around honeycomb paper padded for helping absorb shock and press during shipment to keep items safe. Eco-friendly materials fully speak your sense of social responsibility and the high quality of the brand, this may help you establish a lasting impression with your customers. Reusable: Each envelope mailers contains 2 self-sealing adhesive strip and could be used twice, these padded mailers are ideal for round trip (two way) fulfillment of samples, replacement parts, exchanges, returns, documents. Tamper Resistant Protection: These honeycomb padded envelopes are crafted with premium kraft paper and feature a built-in padding that better protects items. The strong stickiness prevents your items from being tampered with during transportation. Suitable for Various Purposes:These honeycomb padded envelopes mailers are ideal for mailing documents, books, and your small business. Waterproof paper surface is easy to write, paint, and label on it.