Please note: Letter rates are only for normal business envelopes (sizes #6 or #10), which are no larger than 6-1/8" in height and 11.5" in length. Standard manila envelopes are considered large ...

The W+D BB820+ will handle all direct mail envelopes sizes from a #7 (3¾ x 6¾“) envelope now up to a 10 x 13” flat with a package thickness of up to 6/₁₀”.