I could probably write an essay on this, but I'll stick to a short version here.
1. Fire Wallet and or Assassin Wallet
2. PK Ring.
3. Magicians Wax
4. Loops and or Invis. Thread.
5. Deck of standard Blue or Red rider back Bikes.
6. Coin Effect (I prefer Hopping Halvs, but any will do)
7. Flash Paper/cotton/string/bills
8. Business Cards preped with "Out To Lunch" gimmick
9. Small pocket sized notepad of paper.
10. Sharpie
11. Himber Eye Glass Case or Wallet.
12. Knowledge of how to work Psychokenetic Silverware & Time
13. Sponges
14. 4 Silver Walking Liberties
15. 4 Silver Morgan Dollars
16. Shells for your Liberties and Morgans
17. Coin Purse.
18. Invisable Deck
19. Cell Phone w. Camera
20. Swami Gimick.
Wow and if you fell in a lake with alla that on you, you could drown ha ha.
Also, reading this short (sighted) list I'll notice that not ONE of you has mentioned a thumb tip.. for shame.
Get some double backed cards and heck even some double facers, if nothing more than to create and play with. You want an accessory that NO one is using, card indexes.
You don't NEED a bunch of gimmicks to do magic. Learn impromptu stuff so you could do a show out of someone's purse or pockets. Get a pen thru bill (Personally I have always used a sharpie marker version).
I carry a deck of cards with one double backed card in it. A TT, and sharpie (regular). I have a close up bag for anything else when I do shows.
Also, for those who think you need a special wallet to do card to wallet, you don't. There are many ways to use your OWN wallet to do that effect.