There's a Bivy in there. It's all rolled together so all I need to do is unpack it, roll it on the ground, and crawl in. 2 minutes.
Thanks for the reply. Bikepacking fascinates me. I'd need to make quite an investment for bags, harnesses, sleeping bag/tent, etc. I have some stuff, but I'd probably need to drop $5oo to be better prepared. If I ever get myself to do it, I'm sure I won't start in the winter.
A bivy does seem like the smallest, lightest and fastest set-up, so I totally get why its your choice for what you are doing. I see myself preferring a small tent to be more than a sleeping cocoon. Of course, that means one more "roll" to try and strap on somehow. Perhaps a small enough tent could still be rolled together with a higher temp sleeping bag and still be about the size of your "sleep system".