Tricks I ALWAYS have on me (since they fit and do not bother me):

1. Some half-dollars
2. A regular deck of cards
3. Quadriflex (in my wallet)
4. 2-Card Monte (in my wallet)

Once in awhile I will carry around my gigantic Half-dollar (which costs me $2) and it is the same year as one of my regular ones. It is about 1cm smaller than palm so I can just barely fit it into my hand. It's great to do just for laughs.

Two decks of bikes , coins and a TT, when I used to smoke I always had cigarettes on me, but now that I don't smoke I borrow from strangers to make disappear and reappear. Just on th spot stuff.

I prefer to carry a deck of card, some coin, my folding coin, and two rubber band. that's all for my little show!!!!!!!!!

Rubberbands... Easy to carry. Full examinable and extremely pratical... Loops are great too.
Scotch and soda , Pyro Perception...

Rubberbands on my wrist to perform handcuffs, joining and climbing ring.

Rubber bands for a 4 phase routine that leaves them stunned or for a fun puzzle you can not beat the Wonderbill.

A TT, deck of cards, coins, loops, sponge balls (on occasion), oddball (uses grandma necklace principle but I have everything examined and set it up right in front of their eyes without anyone being the wiser), Kolossal Killer.

Jimmy

A TT and a deck of cards.
Sorry not that exciting - seems like a lot of us concur!

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Brian

3-D Cash plus other bill tricks in my wallet
Ghost Crystal
Haunted Key
A pack of Bikes
My Business Cards which I use for a card trick

I always keep some extra things in the car

Mr Mike

Im a beginner so actually I don't carry anything. but I aint either getting asked to show a trick just like that. a normal deck off cards, that's all I need. and mostly I make tricks at parties where there are cards.

Nothing you can take out of your pocket is as natural and innocent as a coin. For the impromptu demo that proves you can perform miracles take a quarter out of your pocket (better yet borrow one), do a retention vanish, use the Kaps subtlety to show both hands empty, turn hands palm down with coin classic palmed, load it back into the hand from which it "vanished" make it re-appear, and hand it back to your new friend. You have just demonstrated that you are a magician and not some guy who "knows a trick".

David Acer's 'Spare Change'. You'll never leave home without it!!!!!!!!!!!!!!

I normaly have my bikes with me but if not there is always something at hand,coins,pens,napkins etc.

In my pants:
- TT loaded with silk
- Spongeballs
- Some Coins
If I wear a jacket:
- Mirage Deck
- Brainwave Deck
- Regular Deck
- double face and double back card
- Pen through dollar

Gotta be cigarette through coin and coin in bottle for easy fit in the pocket usage

The basics:
A deck of cards for all kinds of card tricks.
A pen for doing any prediction trick
and a coin.

Can't belive that there a no TT's in Australia and London...

Living in Canada, I carry a toonie shell and a TT.

I am surprised that so many carry a deck (or decks!) of cards for impromptu magic. Maybe I hang out with a strange crowd, but most people I know would think it pretty weird if someone "just happened" to have a deck of cards in their pocket ("And what do you carry in your other pocket? A chess set?").

That said, I have started carrying four stranger cards with me -- two each of bridge and poker size: one somewhat worn and dirty, the other fairly clean and new. Tricks using duplicate cards are only puzzling when done with your deck, but they become miracles when done with a borrowed deck.

I try to keep a deck of cards on me, but sometimes it gets left behind. But I always have a pack of cigarettes on me for magic.

I always have my wallet on me, so I keep coins in there for tricks. I got 2 1/2 dollars, 2 English pennies and a funny east African coin with a hole through the middle. With these 5 coins and "magic hands" you can do so much! I also always have a T.T with a blank piece of paper for note change. Besides all this I usually carry a loop on me as well.
I feel this is more than enough to do plenty magic and takes up very little room. What more is it looks as if you not prepared. The T.T and loop are utility gimmicks and no-one know you got them.