Size, then fill
Packaging Boxes starts with a carton close to the goods. Void fill is for the awkward shape that still leaves a gap: loose chips, paper void fill, or Ecoflo peanuts made from corn starch.
Recycled air pillows and recyclable paper void fill are on the eco-friendly page. They do not make an oversized carton into a good carton.
What does not fill
A crash lock’s peel-and-seal strip closes the box. It does not pack the void. Bubble wrap cushions a surface. Edge strips guard a corner.
If the closed carton can be shaken and the goods move, add fill or change the size.