A lot of variables depending on the time of year and purpose, but these are pretty constant.

Shelter (10x10 tarp or Silvertip, seasonal)

Fire starter (Ferro rod, Bic, waterproof matches....all three)

Knife (typically a simple Mora Companion)

Water (usually 1 qt Nalgene canteen)

Snacks (clif bars or similar)

Chapstick

Gloves

Extra hat (seasonal)

Extra layer (seasonal)