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The salt packet is cute, but I don't think QR codes can go small enough to dominate this area for long.

There are inherent limitations: http://www.qrstuff.com/blog/2011/11/23/qr-code-minimum-size

Besides the regular Qrcode there's also Mirco Qrcode[1]. Also the Reed–Solomon error correction in qrcodes take up a lot of datablocks. If a new standardisation for mirco qrcodes would allow for a version without error correction you could store even more.

[1]http://www.qrcode.com/en/microqr.html

Thank you, father.

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