EXAM 421 WINDOW CLERK
QUESTIONS WITH COMPLETE
SOLUTIONS 2025/2026
GIST - ANSWERSGreeting Customers, Inquiring their needs, Suggesting options best
to the customers' needs and Thanking them for coming to the US Postal Service
Processing Categories - ANSWERSLetters, Flats, Machinable Parcels, Irregular
Parcels, and Outside Parcels.
Letter-Size Mail - ANSWERSRectangular, Between 3.5" to 6 1/8" high, 5" to 11.5" long
and .007" to .25" thick. Max weight 3.5 oz
Postcards - ANSWERSRectangular, between 3.5" to 4.25" high, 5" to 6" long and .007
to .016 thickness
Flat-Size Mail - ANSWERSFlexible, Uniformly thick, Rectangular, Minimum: 6 1/8" high
OR more than 11.5" long, OR more than 1/4" thick. Maximum 12" high, 15" long and
3/4" thick. One of the minimum flat-size dimensions MUST exceed maximum letter-size
dimensions.
Machinable Parcels - ANSWERSMust weigh at least 6 ounces but no more than 25
pounds. High density parcels maximum weight is 15 pounds.(exception for lightweight
parcels)
Irregular Parcels - ANSWERSMust have any one of the following characteristics: Less
than 6" in length, or less than 3" in height, or less than 6 ounces. Rolls and tubes 26"
long or less. Unwrapped, paper-wrapped, or sleeve-wrapped articles that are not letter
size. And articles enclosed in envelopes that are not letters, flats or machinable parcels.
Outside Parcels - ANSWERSLength more than 27", or height than 17", or thickness
more than 17". Weight more than 25 pounds or 15 pounds if identified as high density.
Rolls and tubes longer than 26". Maximum weight for all parcels in 70 pounds. However
length and girth combined can be up to 130" for Standard Post
Nonmachinable Surcharge - ANSWERSFirst-Class Mail letters that will receive the
surcharge are considered if the following conditions exist: Too rigid, contains pens,
pencils, keys or coins that cause thickness of the mailpiece to be uneven, is
polybagged, polywrapped or has an exterior not made of paper.
Priority Mail Express - ANSWERSClass of mail with the Guaranteed by End of Day
delivery(Next 1-day or 2-day), 365 days a year. Offers overnight delivery to most
, locations or the customer gets their money back. Also delivery on Sundays and holidays
for additional fees. Also offers tracking, proof of delivery, insurance up to $100 at no
cost.
Priority Mail - ANSWERSNationwide delivery within one-three days in most locations,
Domestic can weigh up to 70 pounds. Automatically includes USPS Tracking and $50 of
insurance coverage when purchased at retail. Can have Extra Services such as
Signature Confirmation, Insurance, etc.
P.O Boxes - ANSWERSA premier service available to customers at any Post Office.
Offers customers privacy, security, and flexibility with the ability to get their mail when
and where it is most convenient.
EDDM - ANSWERSEvery Direct Door Mail
Dimensional Weight Pricing - ANSWERSApplies to Priority Mail packages that are more
than one cubic foot (1728 cubic inches) and are destined for Zones 5-8. Maximum size
for mailing a Priority Mail item is 108" combined length and girth.
Balloon Price - ANSWERSApplies to: Priority Mail packages addressed for delivery in
local area and Zones 1-4 only. Standard Parcels are applied this price as well. Parcels
that weigh less than 20 pounds but measure more than 84" but no more than 108" in
combined length and girth are charged for a 20-pound parcel.
First-Class Mail - ANSWERSItems that consist of handwritten or typewritten personal
correspondence such as bills, statements of account, postcards, and BRM must be
mailed First Class Mail, Priority, or upgraded to Priority Mail Express
Periodicals - ANSWERSAuthorized publications such as magazines and newspapers
whose primary purpose is transmitting information, Must be published at least four times
a year at a stated frequency
Standard Mail - ANSWERSUsed to send printed matter, flyers, advertising, catalogs,
newsletters, and small packages. A single piece of Standard Mail must weigh less than
16 ounces
Bound Printed Matter - ANSWERSSheets must be permanently-bound by secure
fasteners such as staples, spiral binding, glue or stitching, can weigh up to 15 pounds
Library Mail - ANSWERSContent is limited to books, sounds recordings, academic
theses and certain other items. Must be sent to, from or between educational
organizations, museums and other qualified organizations. Can weigh no more than 70
pounds
QUESTIONS WITH COMPLETE
SOLUTIONS 2025/2026
GIST - ANSWERSGreeting Customers, Inquiring their needs, Suggesting options best
to the customers' needs and Thanking them for coming to the US Postal Service
Processing Categories - ANSWERSLetters, Flats, Machinable Parcels, Irregular
Parcels, and Outside Parcels.
Letter-Size Mail - ANSWERSRectangular, Between 3.5" to 6 1/8" high, 5" to 11.5" long
and .007" to .25" thick. Max weight 3.5 oz
Postcards - ANSWERSRectangular, between 3.5" to 4.25" high, 5" to 6" long and .007
to .016 thickness
Flat-Size Mail - ANSWERSFlexible, Uniformly thick, Rectangular, Minimum: 6 1/8" high
OR more than 11.5" long, OR more than 1/4" thick. Maximum 12" high, 15" long and
3/4" thick. One of the minimum flat-size dimensions MUST exceed maximum letter-size
dimensions.
Machinable Parcels - ANSWERSMust weigh at least 6 ounces but no more than 25
pounds. High density parcels maximum weight is 15 pounds.(exception for lightweight
parcels)
Irregular Parcels - ANSWERSMust have any one of the following characteristics: Less
than 6" in length, or less than 3" in height, or less than 6 ounces. Rolls and tubes 26"
long or less. Unwrapped, paper-wrapped, or sleeve-wrapped articles that are not letter
size. And articles enclosed in envelopes that are not letters, flats or machinable parcels.
Outside Parcels - ANSWERSLength more than 27", or height than 17", or thickness
more than 17". Weight more than 25 pounds or 15 pounds if identified as high density.
Rolls and tubes longer than 26". Maximum weight for all parcels in 70 pounds. However
length and girth combined can be up to 130" for Standard Post
Nonmachinable Surcharge - ANSWERSFirst-Class Mail letters that will receive the
surcharge are considered if the following conditions exist: Too rigid, contains pens,
pencils, keys or coins that cause thickness of the mailpiece to be uneven, is
polybagged, polywrapped or has an exterior not made of paper.
Priority Mail Express - ANSWERSClass of mail with the Guaranteed by End of Day
delivery(Next 1-day or 2-day), 365 days a year. Offers overnight delivery to most
, locations or the customer gets their money back. Also delivery on Sundays and holidays
for additional fees. Also offers tracking, proof of delivery, insurance up to $100 at no
cost.
Priority Mail - ANSWERSNationwide delivery within one-three days in most locations,
Domestic can weigh up to 70 pounds. Automatically includes USPS Tracking and $50 of
insurance coverage when purchased at retail. Can have Extra Services such as
Signature Confirmation, Insurance, etc.
P.O Boxes - ANSWERSA premier service available to customers at any Post Office.
Offers customers privacy, security, and flexibility with the ability to get their mail when
and where it is most convenient.
EDDM - ANSWERSEvery Direct Door Mail
Dimensional Weight Pricing - ANSWERSApplies to Priority Mail packages that are more
than one cubic foot (1728 cubic inches) and are destined for Zones 5-8. Maximum size
for mailing a Priority Mail item is 108" combined length and girth.
Balloon Price - ANSWERSApplies to: Priority Mail packages addressed for delivery in
local area and Zones 1-4 only. Standard Parcels are applied this price as well. Parcels
that weigh less than 20 pounds but measure more than 84" but no more than 108" in
combined length and girth are charged for a 20-pound parcel.
First-Class Mail - ANSWERSItems that consist of handwritten or typewritten personal
correspondence such as bills, statements of account, postcards, and BRM must be
mailed First Class Mail, Priority, or upgraded to Priority Mail Express
Periodicals - ANSWERSAuthorized publications such as magazines and newspapers
whose primary purpose is transmitting information, Must be published at least four times
a year at a stated frequency
Standard Mail - ANSWERSUsed to send printed matter, flyers, advertising, catalogs,
newsletters, and small packages. A single piece of Standard Mail must weigh less than
16 ounces
Bound Printed Matter - ANSWERSSheets must be permanently-bound by secure
fasteners such as staples, spiral binding, glue or stitching, can weigh up to 15 pounds
Library Mail - ANSWERSContent is limited to books, sounds recordings, academic
theses and certain other items. Must be sent to, from or between educational
organizations, museums and other qualified organizations. Can weigh no more than 70
pounds
