These reusable tins are made to fit the solid shampoo and conditioner bars.
The round shampoo bar tin is rust-proof.
!!The rectangular conditioner bar is NOT rust-proof. I do not recommend that you store this tin in the shower! Use only for travel, and allow bar to dry as much as possible before placing it in the tin. Place a folded paper towel in the bottom to absorb water from the conditioner bar and prevent rust.