Perhaps the simplest solution is the most visible?
Feel free to download, print, spread...Overgrow The World's new "Bag Seed Index" to help categorize all those previously "useless" stray bag seeds!
Save those seeds...and use the BSI to be sure you have something to make it easier to know what you've saved down the road when it comes time to plant them!
Just click on "View full size" in the lower-right corner of this image to get the full-resolution image, and print to your little heart's content! (Or till you run out of ink...)