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The MRCOOL

®

 backpack cooling system circulates cold water that 

flows continuously around the body, keeping the wearer cool and 

comfortable during hot conditions. The backpack cooling system 

includes a water circulation system, liquid cooling T-shirt, 3L quick 

release water bladder, mini pump, battery, and a quick fitting. The 

mesh liquid cooling T-shirt with microtubing embedded liner 

provides maximum cooling performance.

1. Take the power bank out of the backpack and check the battery

capacity. The default capacity is 80%.

2. Disconnect the bladder from the backpack circulation system,

fill to the line with water, and lay it completely flat in your 

refrigerator freezor to freeze. If the water bladder is not laid flat, it 

could freeze the quick fitting in an irregular shape.

Operation Step I

1. After the water bladder is frozen, open the lock to add water  

making sure the water flows into the lower quick fitting.  Once it is 

full, lock the bladder.

2.Connect the water bladder with the backpack circulation system

using the quick fittings. 

DO NOT

 connect quick fittings with exces-

sive force as this may damage the fittings.  The ice inside of the 

water bladder should melt within 10-30 minutes. (You can pour 

warm water over the bladder to help melt the ice more quickly if 

necessary.)

3.Connect the power bank.

NOTE: 

You can turn on the switch to check the water circulation 

before wearing the cooling T-shirt. You can also see the water

flowing back to the water bladder, or you can feel cooling by hand 

from the microtubing in 5-10 seconds.

Descriptions:

Preparation:

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