Poshmark has switched to the U.S. Postal Service’s Ground Advantage service to lower shipping costs for buyers, reducing its flat rate from $8.27 to $6.49 as of September 12, the lowest since 2017. This change follows USPS’s rate increases for Priority Mail. While this move aims to benefit both buyers and sellers, it may result in slower shipping times, shifting from a 2-3 day delivery to a 2-5 day timeframe. Poshmark sellers will need to adapt to using non-Priority Mail packaging, though they will have access to free Ground Advantage boxes.

Source: https://www.supplychaindive.com/news/postal-service-ground-advantage-poshmark-shipping/760754/