I read "Extreme Backpacking" and tend to agree on the packing list. For myself, it looks quite similar.

My must-haves are as follows:-
1) Toilet rolls
2) Medication (in case of getting sick)
3) Good walking shoe
4) flip-flops
5) poncho / raincoats
6) torchlight (especially usefull in smaller towns like Songpan)
7) Simple Toiletries - your full facial regime would not work when you are fighting to catch up with sleep)
8) Hat (for sun and cold, depending)
9) Swiss army knife - to cut anything edible or unedible.
10) wetwipes
11) water bottle
12)CAMERA
13) charger
14) batteries
15) adapter
16)and of course some change of clothes
17) & $$$$, plastic
18) additional light weight foldable bag for shopping

Though sound alot but I managed to carry my "harvest" from shopping at the end of my trip.