I received a lot of these at a gathering with other mothers, so I got one. Materials: Nylon, PVC Heat resistance: 120°C Cold resistance: -20°C Sizes: Capacity: 1L (approx.) 17.5 x 25.5 cm / 2L (approx.) 22 x 34 cm Weight: (approx.) 225g / 285g *Please refer to the image for the size of the 2L capacity. Product Contents: Dedicated cover x 1, Hot water bottle body x 1 Colors: Gray / Pink / Brown / Silver Gray / Purple *Please comment on the capacity (1L or 2L) and color when purchasing. *Remaining stock information: Gray 2L: 2 / Gray 1L: 0 / Silver Gray 2L: 0 / Silver Gray 1L: 1 / Purple 2L: 1 / Purple 1L: 1 / Pink 2L: 1 / Pink 1L: 1 / Brown 2L: 0 / Brown 1L: 0 【Easy to Use】 1. With the hot water bottle body in the cover, pour in slightly cooled boiled water (do not use 100°C hot water). 2. Slowly add water up to 2/3 full. 3. Slowly release trapped air, tighten the screw, and check for leaks before use. *A soft, removable knit cover is attached, which blocks the hot water and maintains the effect for 6-8 hours. Notes before purchase: *The way colors appear may differ depending on the settings of your monitor. *Product package specifications may change depending on the time of arrival. Precautions for use: ・For safety, the heat resistance is up to 100°C, but do not pour boiling water as it is dangerous. ・Do not use with the water bottle full. ・There is a risk of low-temperature burns, so do not use it in close contact with your body for a long time.