You can't get much more handy than the 6W solar panel enough to charge your everyday small devices and small enough you'll forget its in your pack
Brand Name: ALLPOWERS
Folded Size: 270 x 170 x10mm
Open Size: 465 x 265 x 3mm
Panel material: Monocrystalline Silicon
Max. Power: 10W
Output: 5V 1.5A ( Max )
Output interface: USB
NOTE: Solar Devices require strong direct sunlight for effective charging