Hi John,
For an ultralight power bank, you have a couple of options:
1) The Nitecore MBP21 kit has a special version of the 21700 battery, and a magnetic clip-on that allows you to charge the battery, and use that as a power bank. The kit also comes with a clip-on lantern.
https://flashlight.nitecore.com/product ... terysystemBattery = 73g
Powerbank adapter = 10.8g
Lantern adapter = 12.8g
You can get the kit from alliexpress for around AUD39, or other places for around AUD50-60.
I have one coming from Bangood
This is an Youtube review:
https://www.youtube.com/watch?v=6aqwArEM9j82) Nitecore NPB1, which is a 21700 battery together with the powerbank circuit, 105g
https://au.lightmalls.com/nitecore-npb1 ... power-bankFor Super light solar panel, the Lixada Solar panel is 80g, rated at 10W but it is probably more like 3-4W. You can hang this on your backpack, I am not sure how effective it will be. Aliexpress has this for AUD20, you can also get that from other sources.
https://www.aliexpress.com/item/1005001348229943.htmlnCharger makes a good 11W solar panel, USD55, 198g
https://ncharger.com/products/11-watt-s ... -batteriesPowerfilm makes a combined powerbank + solar panel
https://www.powerfilmsolar.com/products ... ar-chargerUSD120, 139g, but only 3200mAh