Hi, I'm heading on a camping trip and want to be able to charge multiple batteries. The hub looks good but the adapter/converter is pretty hefty. I'm trying to limit to a 50l backpack.

Thoughts and suggestions?

Either charge it in the drone via a USB charger or get the charging bank or the new battery powered charger/case. Those are pretty much the only three options.

https://forum.dji.com/thread-139560-1-2.html     I just bought my second one of these on Amazon.  Upgraded model supposedly fixes some charging issues the original model had.  I have a review on Amazon, too.  DJI's only charges 3 sequentially while Smatree's charges six, three at a time simultaneously.

NEXGADGET 42000mAh Laptop Power Bank, Portable Outlet Lithium-ion Power Supply for Camping Emergency Backup with DC, AC & USB Output https://www.amazon.com/dp/B071D2N7TS/ref=cm_sw_r_cp_api_GZfPAbHN5SRX8

Got one of these, works real nice.