Fu Global #000 4x8 Inches Kraft Bubble Mailers Padded Envelopes Pack of 50 Opaque and Lightweight Mailers: These bubble lined envelopes are lightweight and do not add to your shipping costs. They are completely opaque and protect the shipped item from prying and curious eyes. You can mail sensitive documents without fear in these mailers. Eco-Friendly and Tamperproof: The Luxury paper Lined Envelopes are eco-friendly as they are made with recycled Kraft paper yet are sturdy enough to be tamperproof. The seamless bottom and two side finned heat bonded seal ensures enhanced protection of your shipment during transit. Multipurpose Envelopes: These envelopes can be used in offices, at home, in shops, schools and everywhere where there is a need for shipping. These mailers come with a full satisfaction . If you are not satisfied with the product we will refund or replace.