So do the contents, so we bought him a Banana Guard.
This is fine, and works well, but the banana guard is twice the size of the banana. It doesn't fit in his lunch pack.
Naturally, then, he needed a cool way to carry his banana to school. Oh, and Kitewife said I wasn't allowed to damage the bananaguard, something about them being expensive...
Step 1: A bit of a bodge
That meant I needed a piece of plastic for the clip. The piece I used came from the stick-out-to-catch-the-paper bit of an old printer. I forgot to take a picture of it in-situ, so I pieced it back together for the shot.
I was after a wider piece than I had available, so I had to hot-glue two pieces together. I trimmed off the oozed excess from the outside, but left it on the inside - partly because I expected the glue to provide extra friction, and partly because I was too lazy.