Claptrap's Secret Stash is a mission in Borderlands 2
You get it after taking Claptrap to Sanctuary
Objectives
Talk to Claptrap
Collect brown rocks
Pilfer Lost Staff of Mount Schuler
Defeat Destroyer of Worlds
Find Stash
Description
Claptrap: You helped me reach Sanctuary, minion, and for that you deserve a reward. I have a secret stash hidden very very far away from where I currently am. In order to find it, you have to perform a series of devious challenges. First, collect a few brown rocks for me. Then, defeat a bad-ass Skag. Then, go for the lost staff of Mount Schuler. Then, you should bring me the head of the Destroyer of Worlds. And then, you should dance for my enjoyment. Let me know when you are done with that job.
Claptrap's Secret Stash
The stash is a place to store items so that all of your characters can access them.