might be just me, but looks gimmicky

I'd strongly suggest a separate well made pack, and a separate well made solar charging system, depending on your budget.

I can't really recommend a pack as I'm not sure what size you'll need for your adventure and/or what other options you'd like to have.

We discussed solar chargers in this thread not long ago, maybe there are newer options I am not aware of.

I also have doubts how useful a solar charger will be in a jungle environment but that's really your call.

Will be watching this thread, I really like to read the discussions on packs and solar chargers, lots of knowledgeable peeps here.