When Casey Neistat isn't behind a camera sharing his daily life with an online audience the size that Bill O'Reilly or Jimmy Kimmel attracts, you might find him ripping open boxes. Lots of boxes. Most of the time, he doesn't know what's in them when they arrive. It might be an assortment of bottled organic juices from the Midwest or a set of fancy headphones. It might be drone gear, or even a pair of live lobsters—butter included. (Neistat gets so many boxes that he has a second office just to handle the mail.) Companies large and small ship him goods hoping he might mention their wares to the 6 million people who subscribe to his YouTube channel.