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Each parcel is assigned to one of three mail processing categories: machinable, irregular, or outside parcel. These categories are based on the physical dimensions of the piece, regardless of the placement (orientation) of the delivery address on the piece. [C050.1.0]
Pieces are subject to the minimum standards in 601.1.0, General Standards, and may be subject to other minimum dimensions, based on the standards for specific rates. [C100.1.2]
Lower weight limits apply to First‑Class Mail, Standard Mail, and Bound Printed Matter. Pieces may not, except Parcel Post, which may not measure more than 130 inches in length and girth combinedFor parcels, length is the distance of the longest dimension and girth is the distance around the thickest part. Lower size or weight standards apply to mail addressed to some APOs and FPOs subject to 703.2.0 and 703.4.0 and for Department of State mail, subject to 703.3.0. [C010.1.2]
Two or more packages may be mailed as a single parcel, if they are about the same size or shape or if they are parts of one article, if they are securely wrapped or fastened together, and if they do not together exceed the weight or size limits. [C100.1.3]
A machinable parcel is any piece that is (see Exhibit 1.5.1, Machinable Parcel Dimensions):
a. 601.1.0.)
b. Not more than 34 inches long, or 17 inches high, or 17 inches thick, or 35 pounds in weight. For books or other printed matter, the maximum weight is 25 pounds. [C050.4.1]
Exhibit 1.5.1 Machinable Parcel Dimensions 
601.1.0, General Standards, are met. [C050.4.2]
Some parcels may be successfully processed on BMC parcel sorters even though they do not conform to the general machinability criteria in 1.5.1. The manager, BMC Operations, USPS Headquarters (see 608.8.1 for address) may authorize a mailer to enter such parcels as machinable parcels rather than irregular parcels if the parcels are tested on BMC parcel sorters and prove to be machinable. Mailers who wish to have parcels tested for machinability on USPS parcel sorting machines must:
a. Submit a written request to BMC Operations. The request must list mailpiece characteristics for every shape, weight, construction, and size to be considered. If the letter requesting testing describes a mailpiece that falls within the specifications of pieces that were tested previously, the mailpiece will not be acknowledged for testing.
b. Define estimated number of parcels to be mailed in the coming year, and preparation level (e.g., destination BMC pallets).
c. Upon acknowledgement from the manager, BMC Operations, send 100 mailpiece samples to the designated test facility at least 6 weeks prior to the first mailing date. The manager, BMC Operations will recommend changes to ensure machinability of parcels that do not qualify. [C050.4.3]
Items categorized as flats, irregular parcels, or outside parcels may not be prepared as machinable parcels. [C050.4.4]
An irregular parcel is a parcel not meeting the dimensional criteria in 1.5.1. [C050.5.0]
An outside parcel is a parcel that exceeds the any of the maximum dimensions for a machinable parcel. This processing category also includes high‑density parcels (other than books and printed matter) weighing more than 15 pounds and exerting more than 60 pounds per square foot (0.4167 pound per square inch) pressure on their smallest side; cartons containing more than 24 ounces of liquid in one or more glass containers; cartons containing 1 gallon or more of liquid in metal or plastic containers; cans, paints; rolls and tubes longer than 26 inches; metal‑band strapped boxes, metal boxes, and wood boxes; articles not mailed in boxes or other containers; and containers with all dimensions exceeding the minimum dimensions for a machinable (regular) parcel, if their coefficient of friction or ability to slide on a smooth, hard surface is not similar to that of a domestic‑class fiberboard box of the same approximate size and weight. [C050.6.0]
Parcels that weigh 1 ounce or less are subject to the nonmachinable surcharge if the piece is greater than 1/4‑inch thick. [C100.4.0]
These standards apply to Standard Mail:
a. Each piece must weigh less than 16 ounces.
b. 601.
c. Except for automation basic carrier route rate pieces and merchandise samples mailed with detached address labels (DALs), the maximum size for Enhanced Carrier Route Standard Mail is 14 inches long, 11‑3/4 inches high, and 3/4 inch thick. Merchandise samples whose dimensions exceed these maximums may be sent at the Enhanced Carrier Route rates if mailed using DALs, provided that the samples meet all other applicable standards and the DALs meet the standards in 602.4.0. [C600.1.1]
705.1.0 is subject also to the residual shape surcharge. There are different surcharges for Presorted rate pieces and Enhanced Carrier Route rate pieces. Only the surcharges for Presorted rate pieces apply to CMM pieces. [C600.3.0]
b. Items weighing less than 15 pounds but measuring more than 84 inches in combined length and girth are charged the rate for a 15‑pound parcel for the zone to which it is addressed (balloon rate). [E120.2.3 and C700.1.0]
Mailpieces described in this section that are mailed at the Inter‑BMC/ASF Parcel Post, Intra‑BMC/ASF Parcel Post, DSCF Parcel Select, or DBMC Parcel Select rates are subject to the applicable nonmachinable surcharge in 453.1.0 unless the applicable special handling fee is paid. An oversized parcel as described in 2.3.1a is not subject to the nonmachinable surcharge. Mailpieces are nonmachinable if they meet any of the following criteria:
b. A parcel less than 6 inches long, 1/4 inch thick, or 3 inches high.
c. A parcel that weighs less than 6 ounces or more than 35 pounds.
i. 1.0 and to be identified by the words "Machinable in United States Postal Service Equipment" permanently attached as a nontransferable decal in the lower right corner of the case.