All the handheld solar chargers with internal batteries are a waste of space, typically they advertise in milli-amps.
You need something that outputs USB and 12v, has mono-crystalline panels that fold together and can generate 10 or 20 amps. 20 amps can recharge a laptop.
Consider adding a Lithium Ion battery bank to your system, recharge your phone, tablet, Kindle, Li Ion and AA/AAA batteries safely at night in the tent.
When cycle camping in France I used to run a Sat Nav from a battery bank and solar panels on top of my baggage.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.