priority medium box usps
priority medium box usps: Jun 12, 2021· USPS Announces 2021 Rate Increase for Shipping Services – Stamps.com Blog. Rates for the Priority Mail Medium Flat Rate Box will increase $0.55 to $13.75 from $13.20 currently. Rates for the Large Flat Rate Box will increase $1.00, to $19.30 from $18.30 (does not include holiday surcharge) in 2020. 2021 USPS Shipping Rate Increase Points of ...