(Strip Number 4725, Original Publication Date, 5 December 1986)
Panel 1: Patrick says it's too bad that Lizzie has a thermos because he's got a juice box.
Panel 2: He then says that juice boxes are waaaaaaay better.
Panel 3: She asks 'how come'?
Panel 4: When he demonstrates the superiority of the Tetrapak by squeezing out a fountain of juice into the air, Elizabeth is impressed.
Summary: Again, a rather bland little thing about a commonplace item. We're starting to move in a world of these now.