When you have more than three of anything. Something of which I am unquestionably guilty.


Having said that:

Two firelighting sources in your pockets.
One means to purify water.
One means to carry it.
One means of wind/water proofing your shelter.
Cordage.
Basic first aid.
Signaling. Torch, mirror and whistle.
Knife/multitool.

Pack the same again in your bag.

It's also worth having a third set of gear to practice with. That way, if it drops in the pot you are familiar and practiced with your equipment. That can be very confidence enhancing when it drops in the pot.