How To Make a Sackboy Costume English web designer Adam made himself a pretty damn cool Sackboy costume. Better still, he wrote up how exactly you can make one too on his website. The 13-step process, which includes buying a plastic bin, bubble wrap, sweat shirts and duct tape, seems fairly doable by even the most spastic of costume creators. Namely me. I have serious thoughts about doing one of these for Halloween. Pirate Sackboy!!! How to Make Your Own Sackboy Costume