I have 2 branches: master | design

Working in design I did a stash and switched to master, made some adjustments. Switched back to design and did a stash apply only to lose all my changes in the design branch.

I am hoping all my work is within a stash as I have not cleared or removed these.

If I do a stash list I get 4 results:

stash@{0}: WIP on design: f2c0c72... Adjust Password Recover Email
stash@{1}: WIP on design: f2c0c72... Adjust Password Recover Email
stash@{2}: WIP on design: eb65635... Email Adjust
stash@{3}: WIP on design: eb65635... Email Adjust

If I try git stash apply f2c0c72 I am getting an error:

fatal: Needed a single revision
f2c0c72: no valid stashed state found

How can I apply a specific stash?

The keys into the stash are actually the stash@{n} items on the left. So try:

git stash apply stash@{0}

(note that in some shells you need to quote "stash@{0}", like zsh, fish and powershell).

Since version 2.11, it's pretty easy, you can use the N stack number instead of using stash@{n}. So now instead of using:

git stash apply "stash@{n}"

You can type:

git stash apply n

To get list of stashes:

git stash list

In fact stash@{0} is a revision in git that you can switch to... but git stash apply ... should figure out how to DTRT to apply it to your current location.