Sizes for Parcels | Postal Explorer - USPS
pe.usps.com › businessmail101Machinable parcels must measure: No more than 27 inches long x 17 inches width x 17 inches high. No more than 25 pounds (35 pounds for Parcel Select and Parcel Return Service, except books and other printed matter which cannot exceed 25 pounds). More about Physical Standards for Commercial Parcels More about Commercial Parcels - Parcel Select
First-Class Mail & Postage | USPS
www.usps.com › ship › first-class-mailFirst-Class Mail ® service is an affordable and easy way to send envelopes and lightweight packages. First-Class Mail Forever ® stamps cost $0.63 (the current 1 oz price) and will never expire, even if the First-Class ™ postage rate goes up. For packages (up to 13 oz), prices start at $4.75.