If there are any inmates reading the site, you might want to pay attention. Instead of polished steel or gleaming ceramic, this letter opener's razor-edged blade is made from 100 percent recycled paper mixed with a water-based resin derived from cashew shells.

It's like a £30 prison shank that can be used to open your mail without shredding the envelopes—instead of settling a grudge between cell blocks. And it comes with a handle made of sustainably harvested poplar wood, and packaging that can presumably be recycled into more eco-friendly shivs. [UncommonGoods via BLTD]