Storage in A2 (spoilers kinda)
If you take Iorveth's path in Act 2, there's a storage chest in the whore-camp outside the Nilfgaardian camp. If you store stuff there, it does not appear in your storage chest at the Inn in Vergen.
Edit: After searching the forums, I saw that you can supposedly purchase the items you stored on the other side from the mysterious merchant. This does not happen in my game.
If you take Iorveth's path in Act 2, there's a storage chest in the whore-camp outside the Nilfgaardian camp. If you store stuff there, it does not appear in your storage chest at the Inn in Vergen.
Edit: After searching the forums, I saw that you can supposedly purchase the items you stored on the other side from the mysterious merchant. This does not happen in my game.