The thickness of the piece in an EDDM mailing determines whether the bundles will be broken into 50 piece bundles, 75 piece bundles, or 100 piece bundles.
A thickness of .0001 to .0402 inch gives you a 100 piece bundle.
A thickness of .0403 to .0536 inch gives you a 75 piece bundle.
A thickness of .0537 inch or greater gives you a 50 piece bundle (up to the point where it exceeds a maximum bundle size allowable by the USPS)
EDDM: How to get 50 piece, 75 piece, or 100 piece bundles
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EDDM: How to get 50 piece, 75 piece, or 100 piece bundles
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