A simple bed bug monitor using a coffee cup insulator sleeve. Some are flat cardboard and some are corrugated cardboard. Fold it flat, paperclip to keep closed. Place in laundry so it will smell more like you. Leave overnight or longer. Take it and place it under pillow, between mattress and box spring, along wall and under furniture. Work over a plate or container. After one day or longer, pick up and remove paperclip. Squeeze folded edges together to open it up and then look inside. You can place the sleeve into a Ziplock or Slidelock bag as evidence.