First, I bought archival boxes to lay photos flat, organized by family, rather than having them filed vertically in a folder. Next, I put every single photo into a clear, acid-free, protective sleeve or resealable envelope for long-term storage and protection. (Vendors who offer boxes and sleeves are mentioned on a number of sites, including on Cyndi's List.)
The recommendation to "put a sleeve on it" comes from multiple expert sources, such as:
Now when I have a few minutes, I choose one of the sleeved photos, write a caption on a separate adhesive label, and stick it to the front or back of the protective sleeve. Later, I'll type the captions, print them, and put them into the boxes with the photos (not inside the sleeves or touching any original photos).
The caption on this photo explains not only who the boy on the pony is, but why a pony is standing on the sidewalk in front of a Bronx apartment building, circa 1919. Future generations may not know that entrepreneurs brought ponies to street corners, offering "photo opps" for kids of city dwellers at a low price.
I really want my heirs to know! And for now, a scribbled caption is better than no caption at all, right?
PS: Don't forget to inventory the photos. See "sample templates" on the tab above right.
Want more detail on "how to" sort photos, preserve them, and decide what to keep/what to give away? Please check out my new book, Planning a Future for Your Family's Past.