A backpack with ventilation system
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People usually sweating a lot when carrying a backpack. Those sweating will lead to the next problem : shirt become wet and bad smell on our shirt.
So this backpack was created to solve problems like that.
The ventilation system didn't use electrical or mechanical parts and this backpack also has waterproof + not heavy.
This is a video showing how the ventilation system on the backpack works :
The price is €169, not cheap but not expensive either.
All images from :
1air
Hunter: 
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