The Postal Service is reminding customers that metallic mercury and devices containing metallic mercury are always prohibited in the mail stream.
This includes antique items such as thermometers, barometers, blood pressure monitors and similar devices.
| Quick Service Guide > 201e Quick Service Guide Overview Measuring Length Plus Girth (201.7.0) For parcels, length is the measurement of the longest dimension and girth is the distance around the thickest part (perpendicular to the length). Except for Parcel Select, no commercial priced mailpiece may measure more than 108 inches in length and girth combined. Parcel Select pieces measuring over 108 inches but not more than 130 inches in combined length and girth are mailable at the applicable oversized price (253.1.0). The Postal Service classifies parcels as machinable parcels or nonstandard parcels. Machinable Parcels (201.7.5) If you prepare your parcels so that they can be processed on Postal Service equipment, your mail is “machinable.” Machinable parcels must meet specific standards for size, shape, content, and weight. Minimum weight: 3.5 for USPS Marketing Mail parcels only. Maximum weight: 25 pounds. Lower weight limits apply to USPS Marketing Mail and Bound Printed Matter. Dimensions: Soft goods wrapped in paper or plastic bags and printed matter are machinable only if all packaging standards in 601 are met. Nonstandard Parcels (201.7.7) Nonstandard parcels exceed any of the maximum dimensions for machinable parcels. This category also includes cylindrical tubes and rolls, certain high-density items, cartons containing more than 24 ounces of liquids in one or more glass containers, cartons containing 1 gallon or more of liquid in metal or plastic containers, and items in 201.7.6. 
USPS Ground Advantage — Commercial (201.8.3) Maximum weight: 70 pounds. Maximum dimensions: 130 inches in length and girth combined. See Quick Service Guide 280, USPS Ground Advantage — Commercial parcels Bound Printed Matter (201.8.6) Maximum weight: 15 pounds. For additional information, see Quick Service Guide 260b, Bound Printed Matter Nonstandard and Machinable Parcels. Media Mail Maximum weight: 70 pounds. For machinable parcels, see Quick Service Guide 270b. For preparation of nonstandard parcels, see 275.6.3. Library Mail Maximum weight: 70 pounds. Barcode discount: available for machinable parcels (50-piece minimum), mailed at Basic prices. For prices, eligibility, postage payment, and mail preparation, see Quick Service Guide 270b. USPS Marketing Mail Parcels (201.8.4) Maximum weight: less than 16 ounces. All USPS Marketing Mail parcels must bear the correct Intelligent Mail package barcode (IMpb). Parcels not meeting the requirements for use of Intelligent Mail package barcodes will be assessed a nonbarcoded fee. See Quick Service Guides: 240h USPS Marketing Mail Machinable Parcels 240i USPS Marketing Mail Irregular Parcels 240j USPS Marketing Mail Carrier Route Irregular Parcels Parcel Select (201.8.5) Parcel Select Destination Entry packages are priced based on weight increment and the entry of each adddressed package. Oversized Price: pieces measuring more than 108 inches in combined length and girth, but not more than 130 inches in combined length and girth, are mailable at the applicable Parcel Select oversized price. Examples of Dimensional Weight and Oversized Price | Priority Mail Express, Priority Mail, USPS Ground Advantage — Commercial, and Parcel Select Destination Entry Dimensional Weight for Rectangular-Shaped Parcels. For dimensional weight for nonrectangular shaped parcels, see 213.1.5.2, 223.1.5.2, 253.1.3.2, 283.1.4.2. | 
| Dimensional Weight: Yes In this example the dimensional weight for a package is 51 pounds. - Round off each measurement to the nearest whole number (length = 21, height = 20, and width = 20).
- Multiply length by height and then this total by width (21 x 20 x 20) = 8,400 cubic inches
- If more than 1,728 cubic inches, divide the result by 166 and round up to the next whole number to determine dimensional weight (8,400/166 = 50.60). Dimensional weight = 51 pounds.
| Parcel Select Destination Entry and USPS Ground Advantage — Commercial Oversized Price If: | 
| Oversized Price: Yes In this example, length and girth is 130 inches. |
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