Came across this on instructables and thought I should share:
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Nice. A good alternative to laser cutting EVA foam or using pick-apart semicustom foam sheets. Probably more sustainable too, cardboard paper product versus petrochemical foams.
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Especially if you happen to have a ridiculous stack of cardboard, from say, buying too many vinyl records. 
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that is really clever.
might have to adopt that for few things.
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or from the eleventy seven amazon deliveries you got this week.
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I saw this but it didn’t register how good of an idea it is till you made me take a second look thanx.
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A great way to make a custom-sized box for shipping finished goods
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