Fill the bathing bag with water and hang it on the branch with backside exposing to the sun, and this PVC shower bag will effectively absorb the solar energy to heat up the water to about 86F°(30°C) in 3 hours with direct sunlight so you can take a shower after sports outdoors.
To hold 20L water, enough to flush the bath for 8-9 minutes(40L for 10 minutes).
Solar energy to heat up the water to about 86F°(30°C) in 3 hours with direct sunlight.