DIY mini Bulletin Board

Cut felt/cloth, twice the size of the box

Glue it around the Corrugated fiberboard and leave it to dry completely. 

meanwhile, design the outer cover and stitch an elastic band in between if u don't want to paste the board. I placed a file fastener before nailing it for stronger support  

Slide the board in and its done. With the elastic in between, it is easy to slide in papers without pinning it