1. A more lightweight alternative to all boarded envelopes

2. rigid board back protects items in transit do not get bent / creased

3. hot-melt peel & seal ,easy to closed

4. print red "please do not bend" on face ,

5. included 50% recycled material ,after use can 100% recycle                                                             
6. light board and thin,thus can save material and cost                             
7. customized size and print artwork