Related Clues:

• Sends by truck
• Drifters?
• Ark and bark
• Common origami figures
• Ocean vessels
• Harbor vessels
• Sailing or whaling vessels
• Vessels at marinas
• Regatta entries
• Sends by UPS, say
• Crabber and cutter
• Is mailed out
• The fly-by-nights get just about nothing in the water
• Things traveling on sound waves?
• Tug and junk