What are the package types names for UPS/FEDEX/USPS?

UPS

UPSLetter: 12.5" x 9.5"

UPSExpressBox: Used for documents, binders, and larger shipments

UPS25kgBox: 16.5" x 13.25" x 10.75", typically up to 55 lbs. 

UPS10kgBox: Usually 16.5" x 13.25" x 10.75", up to 22 lbs. 

Tube: Designed for blueprints, posters, and fabric samples. 38" x 6" x 6"

Pak: Padded, flexible container. 16" x 12.75"

SmallExpressBox: Dimensions vary, designed for small shipments, 13” x 11” x 2” 

MediumExpressBox: Larger than SmallExpressBox, dimensions vary. 16” x 11” x 3”

LargeExpressBox: Largest of the express boxes, dimensions vary. 18” x 13” x 3” and can take up the weight of up to 30 lbs

FEDEX

FedExEnvelope: For documents. No weight limit. 9.5" x 12.5" and reusable 9.5" x 15.5".

FedExBox: Varies in size, used for documents and smaller items. 

FedExPak: Padded pak for documents or small items, usually 12" x 15.5". 

FedExTube: Designed for blueprints, posters, etc. 

FedEx10kgBox: Up to 22 lbs, dimensions vary. 

FedEx25kgBox: Up to 55 lbs, dimensions vary. 

FedExSmallBox: Used for small shipments. 

FedExMediumBox: Medium-sized shipments. 

FedExLargeBox: Large shipments. 

FedExExtraLargeBox: Extra-large shipments. 

USPS

Card: Typically up to 4.25" x 6".

Letter: Typically up to 11.5" x 6.125". 

Flat: Flat rate packages are those exceeding one of these dimensions: over 6-1/8 inches high, 11-1/2 inches long, or 1/4 inch thick, but not exceeding 12 inches high, 15 inches long, or 3/4 inch thick, and weigh no more than 13 ounces. 

FlatRateEnvelope: Ships for a flat rate, varies in size. 

FlatRateLegalEnvelope: Designed for legal documents, ships for a flat rate. 

FlatRatePaddedEnvelope: Padded version of flat rate envelope. 

Parcel: Standard packages. 

IrregularParcel: Packages with irregular shapes. 

SoftPack: Flexible packaging. 

SmallFlatRateBox: Ships at a flat rate, 8 11/16" x 5 7/16" x 1 3/4". 

MediumFlatRateBox: Ships at a flat rate, two sizes generally, including 11" x 8.5" x 5.5". 

LargeFlatRateBox: Ships at a flat rate, 12" x 12" x 5.5". 

LargeFlatRateBoxAPOFPO: Specially sized for APO/FPO addresses. 

RegionalRateBoxA: Varies by size and shape, rates based on distance. 

RegionalRateBoxB: Larger than Box A, rates based on distance.