A free mod for Witcher 3, by DJ_Kovrik.
In "Additional Stash Locations," new stash locations are added, and some existing stash locations are relocated. A request from Nexus forums led to its creation.
It works for both the game versions 1.0 and 1.31.
It allows you to reach a few previously inaccessible locations, including Kaer Trolde, the Crossroads, Velen, and the Upper Mill. You can also go to new places like Skellige, Toussaint, and Svorlag.
You can get to these places using special items in their respective locations. For example, in Skellige, you can get a special box that allows you to open it and get a special item that lets you go to Skellige. In Velen, you can get a special item to go to the Crossroads and the Upper Mill.