pack rat

pack rat
pack rat  {n.},  {informal}
A person who cannot part with old, useless objects; an avid collector of useless things; a junk hoarder.
"Why are there so many things in this room?" John asked. "It is my brother's room, and he is a pack rat; he is unable to throw stuff away."
Categories: {informal} {n.}

'pack rat' on video