Ventila Backpack Fan

The Ventila backpack ventilation fan invention keeps you cool on hikes and hot days. The Ventila can be fitted onto existing backpacks, without changing the pack’s look and fit. Once in place, the battery-operated device helps cool the wearer’s back via its powerful fan, lowering the temperature about 6°F. The Ventila’s magnetic mounting system makes it easy to switch between packs, and the device is small enough to fit in a water bottle pocket when not in use.
https://www.trendhunter.com/trends/ventilation-fan

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