The wife and I run this

Not sure about the jumbo BK cups but I've managed to close it with 2 mexican cokes in before, angled a bit, the fact that it's all flexible helps. Does a very good job on the insulation front, had a milkshake in it for like 40 minutes because of a double and it was still frosty on the outside when I delivered it.

The drink slots section is also removable so it can function as an extra hotbag for a smaller part of an order.

My only worry with it is it tipping over when braking if you've got two drinks in one side of it and nothing on the other.

I use this for drinks, it doesn't hold the stupid big ones, but most everything fits and keeps things secure.

https://www.amazon.com/gp/product/B08M8XT9L5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Best 3 dollars I’ve spent.

Definitely a great r/frugal option. If you want to splurge, there's insulated drink caddies. This is the one I got: https://www.amazon.com/Drink-Caddy-Insulated-Portable-Carrier/dp/B08M8XT9L5/ref=sr_1_17?dchild=1&keywords=drink+caddy&qid=1632086959&sr=8-17

An important qualification here is I was full time for years before getting something like this. Time and experience told me I really should get some kind of quality, sealable drink carrier, both in the event that the restaurants are out of carriers, to keep certain drinks insulated at the desired temp (whether cold or hot ), and also a solid anchor to keep drinks from spilling in the car when I have to make sudden maneuvers. I probably wouldn't get something like this if I was part time, and I'd opt for the aforementioned frugal option.