General Description:● Before first use， washing shower bag with soda water● Put brown color side up to absorb the sunshine● The temperature of water can change from 15.5 degrees to 40.5 degrees when heating three hours● 50 degrees is the maximum of water ● Can't drink the water， when unused pour the water out Details:Type: Backpack Accessories For: Camping，Other，Traveling Material: PVC Capacity: 20L Package weight: 0.351 kg Package size (L x W x H): 29.00 x 12.00 x 4.50 cm / 11.42 x 4.72 x 1.77 inches Package Contents: 1 x 20L Solar Energy Heated Shower Bag