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They've also released Sketch resources for Material Design.[0]

0.http://www.google.com/design/spec/resources/sticker-sheets.h...

What's with the huge difference in file sizes on the Illustrator and Photoshop version downloads (~200MB+) vs Sketch (~3MB)?

PSD file size I could understand if they had rasterized the 2 color icons but shouldn't vector AI file sizes be similar to the vector Sketch file sizes?

Illustrator's .ai files have a fairly huge base size. An empty document is over 640 kB.

I think there's a bunch of stuff in the file to support older Illustrator versions -- PostScript libraries, stuff like that...

.sketch file doesn't include bitmaps.

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