A cover is an envelope or wrapper that has been used to carry the mail.  A cachet is a design applied to a cover usually to commemorative a special event or activity.  A Scout Topical collector will often collect both First Day Covers for new Scout stamp issues and uses of Scout stamps on covers.

• Boy Scout First Days
• Girl Scout First Days
• US Philatelic Collections  FDC and more
• US Scout Stamp Show Cards
• Scouting Covers Provide Easy Start
• A Word About Scout Covers
• Scout Stamps on Commercial Covers
• Girl Scout Special Events
• Why Registered Covers?
• Baden-Powell Covers
• An Almost Unlimited Quantity and Variety in Scout Cover Collecting
• Highway Post Offices  HPOs
• Railroad Post  RPOs
• Air Mail
• Special Handling  Registered, Postage Due, etc.