Designate bags or boxes for removal. Use a bag for library books, and paper grocery bags for Goodwill or the bookstore. Labeling the bags can add to the ease of the process, as well.
Establish where the designated bags live between returns. Not everyone has roomy pantries, mudrooms or garages. You may need to keep your bags out in the open, which isn’t such a bad thing — because out of sight is often out of mind.