Used a few times, and stored after washing immediately after use. There are no noticeable stains! If you have any concerns other than the photos provided, please comment, and I will add more photos! Please understand that this is a used item before purchasing. I am referring to the following description of the same lunch box found on Amazon. *I couldn't find the chopsticks case, but it's a product from the same series. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Material: Silicone, ABS Brand: Afternoon Tea Pattern: Solid Shape: Two-tiered, Slim Materials: Surface Coating: Urethane coating Top lid/Body: PET, ABS resin Inner lid: Polyethylene Gasket/Belt: Silicone rubber Antibacterial coating on the inside of the body/Inorganic antibacterial agent Size: Capacity: Upper tier 400 ml, Lower tier 220 ml Width: 17.2 cm, Depth: 7.6 cm, Height: 9 cm Product Notes: Heat resistance: (Top lid, Body) 140℃, (Inner lid) 70℃ Cold resistance: -20℃ Antibacterial treatment does not work against all bacteria. Water may leak as it is not a sealed container. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~