Free forwarding if recipient has filed change-of-address form, or return if the item is undeliverable. Media Mail—formerly “Book Rate” Books and recorded media only. No advertising. Pricing by weight only. Transit time similar to Parcel Post. Cheaper than Parcel Post but only due to increased restrictions on package contents. Library Mail Similar to Media Mail, but cheaper and restricted to academic institutions, public libraries, museums, etc. The Post Office will not deliver packages heavier than 70 pounds (32 kg) or if the length (the package’s longest dimension) plus the girth (the measurement around the package at its largest point in the two shorter dimensions) is greater than 108 inches (270 cm) combined (130 inches [330 cm] for Parcel Post)[142] Bulk mail See also: Bulk mail USPS Dodge Caravan used for residential delivery in Omaha, Nebraska USPS-operated minivan serving in the LLV’s role Discounts are available for large volumes of mail. Depending on the postage level, certain conditions might be required or optional for an additional discount: Minimum number of pieces Weight limits Ability for the USPS to process by machine Addresses formatting standardized USPS-readable barcode Sorted by three-digit ZIP code prefix, five-digit ZIP code, ZIP+4, or 11-digit delivery point Delivered in trays, bundles, or pallets partitioned by destination Delivered directly to a regional Bulk Mail Center, destination SCF, or destination Post Office Certification of mailing list accuracy and freshness (e.g. correct ZIP codes, purging of stale addresses, processing of change-of-address notifications) In addition to bulk discounts on Express, Priority, and First-Class Mail, the following postage levels are available for bulk mailers:

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Former Tyvek envelope design for Express Mail before July 28, 2013 As of April 2011, domestic postage levels for low-volume mailers include: Priority Mail Express (Formerly Express Mail): Overnight delivery guaranteed to most locations[142] Sunday, holiday and 10:30 am delivery available for additional charge. $100 insurance included. Tracking included. Flat Rate envelopes are available. Otherwise, pricing varies by weight and distance. Priority Mail: Day specific delivery service ranging from 1–3 days depending on origin of shipment (not guaranteed) As of January 27, 2013, tracking via Delivery Confirmation is now included on all Priority Mail shipments.[142] Flat Rate envelopes and boxes (various sizes) are available free from the Postal Store. Otherwise, pricing varies by weight, size and distance. $50 insurance for retail/$100 insurance for commercial starting on July 28, 2013. Tracking Included First-Class Mail 2- to 3-day delivery.[142] In most cases for letters and small packages. Rate varies by size and weight, but not distance. Postcards (5″ × 3.5″ × 0.007 to 6″ × 4.25″ × 0.016″ [127 × 89 × 0.18 to 152 × 108 × 0.4 mm]): 35¢ Letters (up to 11.5″ × 6.125″ × 0.25″, 3.5 oz [292 × 156 × 6.4 mm, 100 g]): 50¢ + 21¢ for each additional ounce Large Envelope or Flat (up to 15″ × 12″ × 0.75″, 13 oz [381 × 305 × 19 mm, 370 g]): 90¢ + 21¢ each additional ounce (28 g). Must be rectangular, uniformly thick, and not too rigid. Package/Parcel (Up to 108 inches (270 cm) length plus girth, 13 ounces (370 g): $1.95 + 17¢ each additional ounce (28 g) over 3 ounces (84 g)) USPS Retail Ground (formerly Parcel Post) Slowest but cheapest service for packages too large or heavy for First Class—uses surface transport. 2- to 9-day service to contiguous U.S., 4–14 days internal to AK/HI/territories, 3–6 weeks between mainland and outlying areas (travels by ship).[142] Variable pricing by weight, size and distance.