air
airmail
background
bunch
business
circle
circular
class
colors
commerce
communication
correspondence
document
economy
envelope
european
fragile
freight
germany
italy
label
letter
mail
mailbox
meter
paper
post
postage
postmark
priority
red
send
sender
ship
shipping
sign
stained
stamp
stationery
symbol
template
texture
transport
transportation
write
writer