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that you exchange books for books rather than credits. It saves you and the othr member credits and postage.
You order a bunch of books ou want from a boxer, then they go to your shelf and pick however many of yours they like. If it is less than you chose of theirs than you just tell them which ones are your priorities.
THen they ship your box tyo you and you ship theirs to them. No credits exchanged and less spent on postage.
From the help center:
Box-O-Books lets you ship books for less money, and no credits are needed.
Why use Box-O-Books?
Box-O-Books is a paid subscription feature at PBS