One that packs: a packer of boxes in a warehouse. (noun)
One whose occupation is the processing and packing of wholesale goods, usually meat products: meat packers. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "packer" in a sentence
"Driller 3 that is drilling the relief well hasn't disconnected, but they've put a subsea containment device they call a packer into the well to protect it. ""
"The packer was a taciturn inhabitant of the wilds who seldom indulged in an unnecessary remark."
"How the books (not having been chosen with reference to this great event) were of awkward sizes, and did not make comfortable paving for the bottom of the trunk; whilst folded stockings may be called the packer's delight, from their usefulness to fill up corners."