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those are all quite intelligent things to want to have with you in such a scenario, but I think you are overestimating how much can fit into a backpack.
Excuse you, but I'll be carrying this backpack.
https://odditymall.com/includes/content/giant-jansport-backpack-thumb.jpg
Honestly aside from. The gold in confident you could fit it all in a normal sized pack. Bigger pack just means more gold
okay well I am intimately familiar with solar panels and generators and batteries and the only backpack all that's going to fit in is that comically unrealistically huge red one that "shard" posted below. But being able to lift & carry all that (generator and batteries are no joke heavy) good luck
You can buy small foldable solar panels, and it's a laptop so it's not like the battery is big or heavy. I'm not sure why you'd need anything massive for a device that sips power, just take a normal laptop instead of a high end gaming one and it'll draw like 30W.
I'm not talking about the laptop battery. You need a lithium ion battery system and a power inverter for your solar panels. That's heavy stuff.
So how do small foldable solar panels that charge phones and the like work? Because I presume if they can charge a phone they can charge a laptop, given they aren't really different.
I've never tried those, but I can't imagine they'd be very effective. Do you know anyone who's ever tried those?
No, but they seem to be able to charge a phone, or their own internal batteries. As long as the laptop you take is one designed for long battery life I don't see it being an issue for quite some time.