What do you do with all your junk mail? Do you toss it in the trash and hope you never have your identity stolen, or do let it pile up on your coffee table until you get the motivation to actually shred all those pieces of crap? How about option number three, turn all of it into a kick-ass knife. Yup, this letter opener is made from 100% recycled paper mixed with a water-based resin that’s made from cashew shells. The handle is composed of two pieces of sustainably harvested poplar wood that were locally harvested. Assuming you don’t toss your mail in your trash, you might be carving into some envelopes with your last astronomical electric bill.