One of the great innovations in my lifetime was the Tikka headlamp. Good illumination for reading, astonishing battery life, and so lightweight I actually carry 2 in my pack. Of course there are many good competitors.
Tip — install fresh batteries at the start of the trip.
Amazon.com: Petzl E43P2 Tikka LED Headlamp








This 570gm (1.25lb) pack is one of the most popular for carrying up to 14kg (30lbs).