packer

noun

1. 1.A person whose business is to pack things; especially, one who packs food for preservation
2. 2.A software program that compresses code or data.
3. 3.A ring of packing or a special device to render gastight and watertight the space between the tubing and bore of an oil well.
4. 4.An artificial penis or similar object worn by a drag king, trans man, etc., inside the trousers.
5. 5.An object inserted to hold a space open for the purpose of alignment; a spacer or shim.