CNET’s key takeaways This  solar-rechargeable power station is also a backpack that can carry my camping essentials. I was able to charge my laptop six to nine times, my phone 18 times and my drone five times in one charge cycle. The Bluetti Handfree 2 backpack costs $599 at full price, but it is often on sale for $450. It’s heavy. It weighs 16.5 pounds by itself before adding other gear. The Bluetti Handsfree 2 backpack, which is also a solar-rechargeable power station, is my new outdoor essential. This portable powerhouse lets me keep all my favorite electronics fully charged, even when I’m deep…