Related Clues:

• Something you get Saturday, but not Sunday
• Armor
• Knightly wear
• Knights' garb
• 'You've Got --'
• It might be registered
• It may be express
• Postmarked pieces
• Push the envelope?
• Post office delivery
• It's sometimes certified
• Garb for Galahad
• Junk in the box?
• Kind of bag or box
• Snail ___