air
airmail
blank
brown
bunch
business
card
cardboard
cargo
communication
correspondence
cover
craft
delivery
document
envelope
envelopes
file
grunge
heap
kraft
letter
mail
mailing
message
object
office
package
packaging
packet
paper
paperwork
parcel
pile
post
postage
postal
recycled
rope
send
sheet
space
stack
stationery
stock
template
texture
white
yellow