Never lose a binder. you will have a heck of day trying to find out, and your day will just get worse and worse and worse, like you have no ideas. You can look everywhere and even in the lost and found. If your smart enough you will retrace your steps from the day before.
https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1360&bih=667&q=binder&oq=binde&gs_l=img.1.0.0l10.1387.2328.0.3891.5.5.0.0.0.0.54.246.5.5.0....0...1ac.1.26.img..0.5.246.GsO9AQstxVE#facrc