If you hit a lot of conferences, you’ll likely end up with loads of bold, graphic nylon lanyards. I love what our friends over at Evil Mad Scientist Laboratories have done with their collection of lanyards.
Conference lanyards are often made of nice sturdy woven webbing. They seem like they ought to have plenty of uses, like replacement shoelaces or camera straps. After enough conferences, they start to look like an awful lot of raw material. Even enough to make a bag.