A big issue a lot of players run into during multiplayer is looting a rucksack that they want/need for their own community, but not having an easy means to get it home. Typically players have to keep them on their survivor's back and lug it around, praying the host returns to their homesite, and only then can they place it in a car trunk or on the ground and switch to another character they're not using to basically use as rucksack storage (once again praying the host or any other players in the game don't steal it)
This idea incorporates an option in a host's storage to select and deposit into your own ("My") storage. Upon interacting with the host's storage you would be prompt with a screen with the side-by-side options:
"Host's storage" "My storage"
Again this would only work for depositing, you would NOT have access to your own storage.