Cargo Container Basic Mug is made of premium stainless steel which has outstanding durability and rust-resistance. It is BPA free and easy to clean so that contributes to protection of environment. 2 size options (300ml & 450ml) are available, and cups can be stacked for space utilization. Foldable handle enhances portability, and double-wall structure keeps temperature of contents. Basic Mug can be used not only for camping but also in daily life with its iconic 4 colors and edgy design.