what stuff do i need.

[slowmotion]

A waterproof jacket of some form comes in handy but isn't essential.

 

[billymcq2]

Bottle cage and bottle, if you need to stay hydrated. Maybe not needed if only commuting.

A little under the saddle bag to keep a spare tube , money etc.

 

[Profpointy]

A waterproof jacket of some form comes in handy but isn't essential.

I favour the windproof-fleecy style - though not waterproof as such, you tend not to get soaked through even in heavy rain, and much more comfortable than waterproof proper

 

[Markymark]

Stuff I go out with when on road bike for long rides:

Bike (obvs!)
Mini Pump
2 x Bottle (depending on distance)
Helmet
Glasses

All in saddle bag:

CO2 cannister (I'm lazy!)
Innertube
Tyre levers
£20 note
Charged Phone
mini multitool
Emergency jelly babies
​

At home I have various items for messing around but the essentials would be:

Track pump
wet wipes
degreaser
oil
brush (to get into parts of the chain)​

 

[w00hoo_kent]

It differs a bit between bikes, but for a long ride

Bike
1 x Tool Bottle
1 x Electrolytes Bottle
Helmet
Glasses
Gloves
Hydration Pack
Garmin

In Tool Bottle:
Spare tube
3 tyre levers (I can't do tyres without levers)
1 puncture repair kit (adhesive patches)
Multi-tool with chain tool
Chain quicklink
Cable ties

In hydration pack:
Water
Credit Card
£10 note
Phone
Spare gels
Mini track pump

Jersey:
Gels
Flapjack
Thin waterproof
2nd spare tube

I carry pretty much the same to commute, except only 1 innertube, and no electrolyte drink.

My wife commutes with a tool bottle, similar load out except no multi-tool and a CO2 pump with 2 x 16g bottles. Also, riding a Croix her inner tube takes up more room.

 

[S.Giles]

...something like a joe blow

There's nothing quite like a...er... never mind!

 

[Nigelnaturist]

I go out with
Garmin/Bryton yes both.
Spare tube
levers
patches
pump
flapjack
two bottles of water.
Multitool and chain tool.
lock if needed.
overshoes usually packed, hate wet feet.
Keys

No phone, no money (don't have the former, and never enough of the latter)

 

[Suffolk Cycling]

I am amazed no one else has mentioned this:

You need to get yourself an understanding wife/husband/partner (but not all three, obviously)

 

[Nigelnaturist]

I am amazed no one else has mentioned this:

You need to get yourself an understanding wife/husband/partner (but not all three, obviously)

Depends on your life style I suppose.