[header] How to flatten a box [title] Place the box on a flat work surface. [step] Turn it upside down so that the fixed base is facing up. [title] Remove any tape that might be holding the box together. 
[step] In some cases you may be able to simply lift the tape and pull it across but that isn't always easy to do and if you're doing bulk boxes, it's often impractical. Instead : [substeps] Slide a scissor blade, box cutter or a craft knife through tape.