What useful things do you keep in your car?

[Shapesorted]

Just organising my new car and have bought a storage thing for the boot to contain the crap. What sort of things should I keep in there? I'm a childminder so anything child related is an extra plus point!

I have spare clothes and nappies, carrier bags and a first aid kit. Any more useful ideas?

All of the above plus
A tow rope
A riding hat and gloves
A dog water bowl
A disposable camera
Spare pair of shoes and socks
My cardrobe- clothes I may need - waterproofs - smart shoes - plimsolls- shorts- jumper etc
A 2 litre bottle of water
A spade
Probably loads of other stuff
I could live in my car but I don’t have much room for passengers

Lots of good advice here, just want to add:
Travel Jane disposable urinal (also good for vomit)
Pocket plastic emergency macs
Thoroughly recommend a rubber mallet. Last time I had a flat I couldn’t get the wheel off, it wouldn’t budge. Phoned a garage for advice and they recommended hitting it all around with a mallet. Luckily there was a hardware shop around the corner. It worked, the wheel came loose straight away.
There was an extensive post on the preppers thread about this (where I saw the Travel Jane)

A lot of the above, plus a blue Ventolin inhaler.
Were we all Girl Guides?

I have
Basic first aid kit
Towel
Tissues
Sick bags, they have a gel pad thing and seal up. (Been used for sick and wee emergencies. )
£land ponchos , thin but do the job in an emergency .
Pens & notebook.
Phone chargers.
In winter, a couple of blankets., de-icer, window scraper.
Window sox.
Fold up kite.
Change purse.
Usually an umbrella.

Erm, probably more.

Emergency Diet Coke
Eye drops
Paracetamol
Hay fever tablets
Tissues
Toilet roll
Baby wipes
Hand sanitiser
Spare single use face masks
Indigestion tablets
Lemon sherbets
Chewing gum
Coat
Boots
Torch
Ladder, hard hat, high vis jacket. and spirit level I use for work
Plastic bags and bags for life that I always forget to take in the shops
Paper and pencil
Charging cable
Bottle of water
Ice scraper
First aid kit and red triangle
Dig poo bags

I have many things in my car, and I used to have almost everything in it.
Nowadays I scale back

Useful stuff that might not have been covered include:

Sports bag - I used to keep a bag of sports kit & washing stuff as at work we used to randomly decide to go & play
Clean t-shirt etc
Tent pegs, bungees
Random tools
Water, electrolyte tabs, mints
Wooly hats etc
Emergency hi vis
Waterproof coat, warm fleece
Blanket
Tools - screwdrivers, pliars, pen knives / multi tools
Emergency window breaker/ seat belt cutter
Bulb set
Jump leads and/or battery booster pack (see below)
Sewing kit - I’ve been called on for one a few times. The weekend before last at a village show I was asked by the ambulance crew on site if I had a needle - one of them got glass fibres from their flagpole in their hand (they offered to return the needle afterwards, I declined)

If you have a roof box this is useful:

www.amazon.co.uk/dp/B08JBJ6VKJ?ref=ppx_pop_mob_ap_share&tag=mumsnetforu03-21

It’s a step that clips to your door frame giving an extra step up - when getting down don’t jump straight from the step to the ground, as it’s a lot higher than it seems

For your tyres familiarise yourself with your options:
Do you have a spare tyre or an emergency inflation kit?
If you have a spare then make sure you have a better wheel brace than the basic one with most cars - either a 4 way wheel brace, or a long extending arm and the right adaptor
If you have an inflation kit then check it’s in date, and bear in mind that a ‘repairable’ flat on the side of the road might no longer be repairable once you’d used the emergency seal spray - so consider whether to self fix or call the AA etc. If you have the space then consider getting a spare, even if just for long journeys

Battery booster packs don’t have to be a big case style anymore. Check the engine size of your car and consider one of these types:

www.amazon.co.uk/dp/B0816F2GH9/ref=cm_sw_r_cp_api_glt_fabc_1MEA1TKBP42NSJWPAEBT?psc=1&_encoding=UTF8&tag=mumsnetforu03-21
(I’m not endorsing this one, just showing an example)
They are small and convenient, can be used as a usb power pack or for an emergency start of a flat battery

Only thing I can think of that has not been mentioned already is a small fire extinguisher.

A sanitary towel / tampon

I have food and water, as I'm scared of being stuck on a motorway!

Always have hat sun hat / winter hat depending on season, sun cream, wet wipes, carrier bag to cover seat or put muddy clothes in, pen, umbrella, raincoat.