Clothes
Spare Clothes
Bag of Holding
Campin' Supplies
A Gez Stone (continual flame-ed dull grey ioun stone)
A Weapon
A Backup Weapon
Food and Drink
Writing Supplies and Parchment
A Knife
A Hatchet
I use basically the same stuff most of the time. Clothing (usually Explorer's and/or Traveler's), Backpack, Bedroll, Winter Blanket, Scroll Case, Belt Pouch, Waterskin, and so on.
As for magical equipment, besides the all important Cloak of Resistance, I almost always buy a Heward's Handy Haversack. That's just such a must-have.
We've done the continual light (now flame) light source since 1e days, although I've always felt that was sorta "cheating". A 1st level spell that lasts forever and ever still doesn't "feel" right to me.