Took me awhile to figure this out, so to help the next person....

In one of the pockets you'll notice a "packable" tag. Pull that pocket so it's inside out. Now stuff the jacket into it. The pocket zipper is double-sided so you can zip it up once you're done. It's not a tiny package, but not too bad.

This is a review for the Yellow color, X-Small. For reference, I am 5'7" and 140 lbs with a 36 inch chest measurement and a 28 waist.

This jacket is very comfortable. The inside is soft and fuzzy. The outside is smooth and I think it looks nice. I removed the optional leather strap around the neck and buttons might have been better instead of zippers for the sleeves. The X-Small was snug, but I think the length fit well. My arms do become a bit restricted at the shoulder/chest area, so if you have a similar build and this bothers you, you may want to go a size up. It's obviously not real leather at this price. I feel like it's Asian sizing so the size you get should be determined by your build and how you like your fit. I live in Florida so I can really say how well it holds up in actual cold weather.

It is so easy to use this rain jacket, it has saved me so much time and energy with umbrellas. I can just pull it right out of my backpack and put it on anywhere! I bring it everywhere with me, it has helped me out so so much!

I wanted to like this jacket a lot more than I do.
Pros: waterproof, fits to size, packable and light weight
Cons: I'd have to say the biggest con for me is that it's not breathable. Whenever I wear it, I get really hot (especially when it's humid and rainy) and sweaty and I have to take of the jacket within minutes of wearing it because it's so uncomfortable. If it's during cold weather, maybe it's more tolerable. But I think that's the biggest drawback. It's made and feels like you're wearing a layer of plastic (no inner layer).