As advised, very lightweight backpack. What about the solar panel, it looks like it is usable only under direct sunlight, since anything less than that doesn't charge the phone. When I point 2 very bright table lamps, I get only 3.5V output from usb, what is not enough even to charge a powerbank. May need to be improved with a dc-dc booster to charge at lower light conditions. The solar panel is flexible. I would say it is like an emergency power source rather than for everyday usage. But normally I can just charge from powerbank through the external usb.

I love its compact size while still having plenty of internal room, and while it remains to be seen how well the Solar Powered part works, I am thrilled ... My only complaint is that there was no instruction booklet with it regarding how to use the USB and Solar functions ... that being said, I did find some helpful information in the product description on this site.

Bought for my son for his laptop/school and absolutely love that it is solar powered! Previously we had one that had a build in power bank but remembering to charge it was an issue at times :-) so this is perfect. Forgetting his bag in the car is actually beneficial now.

perfect product, very light, and tested charging cellphone, works really well

I didn't find the solar panel worked very well to power my device. It was very finiky, I had to be in direct sunlight for anything to happen. Don't rely on the solar panel if that is why you are getting this.

Reply by our customer service

Hi, We apologize that the solar panel did not work the way you were expecting. I have sent you an email and I am waiting for your response!

tres bien tel que la photo mais j aurais aimer savour sii on peux alimenter le sac avec prise usb ou si seulement avec energie solaire