Nice and thick 4mil yes, but a bit to snug on the 3x4;But the main thing is that BALLPOINT ink will NOT DRY on the slick white surface: it is NOT some kind of "special writing surface" — it's just opaque white slick plastic the same as the rest of the bag. So: only a Sharpie or similar permanent marker will work (that is: dry and not smear). [Sharpies work on ANY bag, btw.]
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