Boxed--or Stumped!

I was thinking I had met my limits in box-making. I've got to mail this 14" x 18" x 2" book that weighs over 7 pounds. I've got a piece of corrugated cardboard big enough to make a box, but I'm feeling so inadequate! However, I find from my records that I sold--and shipped--another copy of the same book a year or so ago. So I know I can do it. I know I can. Especially if I go eat a peanut butter and banana sandwich first.