20L / 5Gallons Outdoor Solar handle of the bag can be reinforced by the hard plastic tube. Instructions for use: Rinse the shower bag with one tablespoon of baking soda and warm water before initial use. Â Fill the bag with water, then place it on a flat surface with black side up and directly expose to the sunlight. Â Maximum temperature should be attained in approximately 3 hours; it can make the 15degree water reach about 45degree. Â Please test the water temperature before use since it maybe reach 50 Celsius degree in the strong sunshine. Â Camp shower bag can heat water reach over 50degree. You must test water temperature before taking a shower and add some cold water if necessary. Â Please do not heat the water over 50degree, or it will shorten the service life of bag. Â The water in the bag is undrinkable. Â If you do not need to use it, please dry it. 20L / 5Gallons Outdoor Solar handle of the bag can be reinforced by the hard plastic tube.