OP's points still stands. I would add that if your product can't stand this constant hot-cold cycle, don't get in the Canadian market. If you are selling here, we can assume you have accepted the reality of climate and have factored it in your warranty costs.
Anyone who has bought hot food on a cold day has an opportunity to learn about how some containers do nothing and others do quite a bit. Even thin paper versus heavy brown paper makes a pretty big difference in insulation.
Many bags designed for laptops have open cell foam for shock resistance, and thermally conductive foam is a specialty item. You practically can’t make a laptop sleeve without an R value. So it’ll depend a lot on whether your laptop was room temperature when it went in or is warmer.
If you’re looking for a Christmas idea for yourself, I don’t think you find a better laptop bag than Tom Bihn. They have a laptop sleeve that’s practically an insulated lunch bag: https://www.tombihn.com/products/brain-cell with an air gap at the bottom that prevents damage if you drop your bag. Which I have.
Their stuff is expensive, but they’re bombproof and not Apple-expensive. They’re waterproof, including the zippers, the shoulder straps are butter-smooth, and the factory workers are paid a living wage.
Also the temperature change is not a problem while the laptop is non-operating. The alternative therefore is to wait for 10-15 min before turning it on.
What I mean with having fewer warranty claims is that the Macbook doesn't break in the first place. Condensing water is not a problem while the device is powered off, and will evaporate once it reaches room temperature.
Or a Panasonic Toughbook. I've always wanted one. Modular, work from -20 to +60, in the rain etc. Expensive as all hell though.
Also it is a very bad idea to bring a laptop indoors from the cold and immediately turning it on. Condensing water can cause short circuits (people who wear glasses can probably relate). Always let it warm up to room temperature first.
This is not a MIL-STD 810G rugged outdoor device. If you want that, buy a Thinkpad.