Get an old blanket and lay it over the pizza boxes on the seat, covering the sides of the boxes if possible.
If the blanket is large enough, fold it first so that you have 2 or 4 layers keeping your pizza hot.
I have found this to be more effective than insulated bags, especially when the blanket is doubled up.
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(Old blanket so that if there is sauce/grease on the outside, you're not out your favorite blanket)
lifehacks.stackexchange.com/users/15/Mooseman
I'm a pizza shop owner.
I often sell "half baked" pizzas to customers who want to finish baking it at home.
Ten minutes in the oven
and you have a wonderful pizza shop flavor and the warm pizza you are craving.
Ask your favorite shop to "half bake" your pie for you or come to my shop and I will fix u up;)
lifehacks.stackexchange.com/users/6967/Pam
You know the insulated bags used to keep groceries cold on the trip home?
They look like this or similar: They also work to keep things warm.
If you have one big enough for pizza, put it in the bag preferably in the shop, get as much air out as possible, and put it in your car (which should be warmed up first in winter) on one of the seats, then put a towel/folded blanket over it.
Eat as soon as possible after arriving at your destination.
lifehacks.stackexchange.com/users/25/J. Musser
If your car has a seat warmer (most modern ones do), turn it on and put the pizza (in the box) on the seat.
If you really want warm pizza, put a jacket/blanket/something over it.
lifehacks.stackexchange.com/users/49/Kaz Wolfe
I suggest couple of more hacks to keep the pizza warm on the way home: Hot water bottle - Works if you happen to be travelling from home or somewhere with a kettle to fill it up.
Picnic cool box if you have one, as it also keep the warmth inside.
lifehacks.stackexchange.com/users/31728/user31728
Many of you know that problem, after work you go and get some "Pizza to go" from the Italian restaurant. When you arrive at home it is not really warm anymore no matter whether you put it in a bag or not. Does anyone know a lifehack which could help me keeping it warmer?
How can I keep pizza warm on the trip home?
lifehacks.stackexchange.com
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lifehacks.stackexchange.com/questions/369
lifehacks.stackexchange.com/users/171/CodeFanatic
There are many different ways to keep your pizza warm on the way home. You could cover it using some blankets, use an insulated grocery bag, a hot water bottle or turn on the seat warmers if you have them. Alternatively, you could ask your pizza shop to "half bake" your pizza so that you can finish it off yourself at home in the oven. Options include wrapping up in an old blanket, taking the pizza half baked and finishing the baking at home, using insulated grocery bags and using the car's seat heater plus a jacket.
Use an old blanket and wrap around the pizza box as many times as possible. Ask the restaurant to half bake it and then finish off baking at home. Use insulated grocery bags - ideally with a blanket as well. Use the car's seat warmer - ideally with a jacket over the top too. Use a hot water bottle and a picnic cool box.