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It is used for bathing in the camping ground. After storing the water in the sun, you can heat it by this device. Each part can be combined with other field packs.It Small and easy to carry. The black PVC film is beneficial for the endothermic heating to 40 ℃ under the sun. There are thermal insulation effects in eveing that can be combined to increase water.
Wufeng District, Taichung City, China