What are your "must haves"?

[Heifzilla]

When you ride, what absolutely, positively must come with you?

I just started really riding, and I need to start carrying some more gear with me. For the "in case of". I know I should probably carry an extra innertube and a pump, but what else do you guys consider must haves?

[Becky]

For a road ride:

Spare tube
Patch kit
Tire levers
Pump
Multi-tool
ID bracelet
Copies of my driver's license and insurance card
Keys
Cell Phone
Food
Water and sports drink (1 bottle each)

For MTB:
Swap the bottles for a Camelbak
Add a map, first aid kit, more food, and a space blanket.

[Geonz]

If you have a cell phone and a friend with a van, it makes up for a lot

My bag looks a lot like Becky's, though, except the keys. I can't find them anywhere.

[Biciclista]

for any ride:
HELMET
GLOVES
protective glasses.

For rides more than 1 mile:
pump, tube, multi tool, tire levers, cell phone

for rides more than 10 miles:

water

[Zen]

gum
water

[ny biker]

Adding to Becky's list: a pocket pack of tissues and a small bottle of Purell. And band-aids in assorted sizes.

[sundial]

gum
water

Such a minimalist.

[Biciclista]

what is Purell?

[sundial]

The anti-germ stuff.

[Thorn]

I also add kleenex (doubles as toilet paper) and a small packet of chamois butter--just in case.

And after 3 bee stings of progressing reaction, I now also don't leave the house without oral Bendadryl and an Epi-pen in my bag....hope never to need them. I've only been stung 4 times...3 times while riding my bike and twice last year. Go figure.

[ClockworkOrange]

For a ride under 10 miles:

Helmet always, bike lock is always on seat post
Water
Keys
Mobile
Tissue tucked somewhere
Chewing gum, hate riding without it, it's the only time I really eat it

Clock

[HillSlugger]

For a road ride:

Spare tube
Patch kit
Tire levers
Pump
Multi-tool
ID bracelet
Copies of my driver's license and insurance card
Keys
Cell Phone
Food
Water and sports drink (1 bottle each)

For MTB:
Swap the bottles for a Camelbak
Add a map, first aid kit, more food, and a space blanket.

I go out like Becky except I don't always carry the patch kit or food. Everything else is pretty much a must.

[SlowButSteady]

Asthma inhaler
Cell phone
multi-tool
Pepper spray
Water or Electrolyte solution
1 pack of Hammer Gel
If very far from home, add oral Benadryl & Epi-pen
Kleenex

[RoadRaven]

If you have a cell phone and a friend with a van, it makes up for a lot

Yup, that's pretty much me.
Cell phone, water and sometimes my MP3. If I am intending to ride for more than 90 minutes then I'll take a fruit/muesli bar with me as well.

No pump/spares etc. I'm hopeless at changing tires and so I ride with people who can, or I ring someone to pick me up.

[indigoiis]

phone
debit card
id card
key
lock (depends on bike or where I am going)
tube, C02, levers, multitool (in seat bag)

banana or granola bar, just in case. But not always.
water

helmet
gloves
cheap home depot tinted safety glasses