If you looked at my kit you will see that I pack an AMK thermal blanket and a Tacoma Mountain Rescue shelter. I'm pondering on adding an AMK bivvy too.

I have the heatsheet and shelter vacuum packed so they easily slip into my pockets. My kit is actually made to disperse into different components that way.

When out on a dayhike, I'm not planning on carrying a tent, but I do have the emergency shelter options with me. The shelter, blanket, and fire making should make for a comfortable night. I will have more than adequate clothing with me to adjust to a swing of temps from day to night.

I'd like to think that most people on this forum carry emergency shelter in their packs as well, but don't necessarily call it their survival kit.