Off-Topic Forum

I kind of like seeing what gets used. I've seen baby food to beer. Cereals seem to be the most common. 

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I like when I see packaging from microbreweries not sold around here or when the cardboard has been use several times to ship cards.

Another major source of cardboard are USPS priority envelopes given at the post office or old Fedex/UPS envelopes.

By the way, I guess that it can be serious money, because some years ago the tourism office here asked local business to print tourism ads on the back (rear) side of their envelopes.