Kangaskhan Storage is small storage unit run by Kangaskhan in the rescue team and explorers games of the Pokémon Mystery Dungeon series. She will hold any item, and store it for you. Kangaskhan will let you store more and more items, as you rank up.
The Kangaskhan Rock is a special statue that you will run into, in dungeons. They can be used to save the game, or store items. They can only be found in the dungeons that have checkpoints.