>>129858dont listen to the ultralightweight faggots op, carry as much as you want/can for the duration youre going.
two things you should get however:
a frame pack, or a frame that mounts packs onto it.
the ergonomics will save your spine and many trips to a chiropractor in the future.
a nice pair of gelsoles/hiking boots, rucking heavy gear(or even lightweight faggot loads), will take its toll on your joints, these items minimize that toll.