Measure your iPad, laptop or e-reader. My netbook was 11″ wide and this diaper was 14″ wide. This was almost exactly the size I needed (it was a little close), so I’d say leaving yourself an inch (maybe an inch and a quarter) on each side for seam allowance should work.
Turn the fabric inside out and place padding on top. Sew together along both long sides and the bottom, then turn right side out.
It should now look like this, with the padding sewn neatly inside
With better planing, there was probably a better solution for this next step, but I was totally on a time crunch and just made this up as I went along! I ended up with an ugly raw edge on the top half, and not enough extra fabric to do much with it. So, I found some wide ribbon and sewed it on, nice side facing in, then turned it over.
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