I have gotten into the habit of saving most covers these days. As long as they are clearly postmarked, and contain fairly recent issues.
This cover is oversized so will go into my collection of oversized covers. It contains nearly $15 in catalog value worth of stamps and souv sheets.
1998 – Scott #s 1715-1720 Fishing Flies
1999 – Scott # 1768 New Year Souv Sheet
2007 – Scott #2243 Souv sheet of 4
Although the stamps are from up to 15 years prior to the cover, it looks great so I will catalog it and keep it.