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Here's a few choices,

https://www.amazon.com/SOKOO-Portable-Efficiency-Reinforced-...

https://www.amazon.com/Foldable-Waterproof-Efficiency-Cellph...

https://www.amazon.com/Balight-Outdoor-Foldable-Powered-Char...

28W basically gives you an fourth panel, but your backpack is probably 3 panels tall.

Most of these don't provide anywhere near the advertised wattage. And when they do, it's usually in direct bright sunlight (i.e. depending on where you are and what season it is, it can be that efficient only for a few hours, and sometimes none at all).

If you want a decent portable solar panel, get the non-flexible monocrystalline one.

Any suggestions on models?

I like the flexible one because it's lightweight and not easy to break. I'd be open to other options though if you have suggestions.

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