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.