When paying another trusted Samourai user, Stowaway creates a transaction that looks just like any other Bitcoin transaction on chain but is actually a form of 2 person coinjoin. The most powerful thing about Stowaway is that the amount being sent will never actually visible to anyone looking at the blockchain.
Stowaway uses sender AND recipient UTXO’s on the input side of the transaction which completely destroys the common-input ownership heuristic for chain surveillance firms.
Just like Stonewall X2, Stowaway can be constructed in person or remotely.
Read more about Stowaway here