I mostly ship toothpaste and babywipes. Whatever overflow I have at the moment from couponing.
I have also asked for and received variances to ship to battered women's shelters rather than the listed food banks. When I do those, I ship boxed hair color, makeup, skin care products, hosiery, etc. Whatever overflow I have at the moment from couponing.
I always include something for children, like pencil cases, crayons, coloring books, flower packets for kids to plant, etc. I also received lots of full-sized formula samples from formula companies when my kids were babies, and as they were not formula-fed, we never used them. I'd include them as well since they were unopened and unexpired.
I buffered my items with outgrown clothing from my kids', or things of mine that I no longer wore which were still in very good used condition.
I've treated these shops as a way to a) help out, b) purge my house of a bit of overflow, and c) make a little money.
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Plan the work. Work the plan.