USPS retail floor is basically intended for unmarried piece mailings which mean any mailable matter that doesn't to be mailed as priority mail and consists of greater fee for USPS monitoring. https://www.toptenwholesale.com/answers/httpswwwhealthcareresultcomketo-forcera-canada-q3691#answer54873 This retail floor is commonly used for mailing items or merchandise which does no longer consist of a bulk charge for USPS retail floor.