Sleeping bag question

[brianmidmich]

So to start this out, I want everyone to know that I am very new to the world of hot tents and good sleeping bags.
I currently have an Alps Mountaineering 0° mummy bag. I have used it in temps as low as 20° and stayed fairly warm. I was just using a cot with no sleeping pad.
With all that said, what is the go to set up for a proper sleeping system in temps 0-30°? I have a lightweight air mattress but the bag likes to slip off at some point in the night. I also have a fan fold ground pad that I have yet to try. While reading many posts here I ran across something about a sleeping bag liner. Are liners a must with a sleeping bag that is of my bags quality or lack there of? Also is a low profile cot something that should be added or just stick with the Tyvek sheet on the ground?
Thank you all for all your responses thus far. I am learning so much.

 

[Billdoe]

Liner will keep the inside of your bag cleaner. Keep your sweat off the bag and help it last longer.

 

[LongWayAround]

For me, the perfect system is cot/closed-cell foam pad/self-inflating pad/sleeping bag. I'll sleep happily in cold temps without additional heat source.

I would freeze on a cot with no pad. I even use a pad in my hammock, either the closed cell or self-inflating.

My self-inflating pads have a face fabric that is much less slippery than most air pads.

An air pad, by itself, is definitely kind of slippery. Deflate it a little and it's less slippery/more comfortable.

A bag liner is just an addition on warmth and will keep the bag cleaner.

 

[PoniBoy]

I’ve always ran a 15 degree down bag for late season hunts with no issues. You definitely want a quality sleeping pad with a minimum R-Value of 4. Sleeping pad makes all the difference IMO. I’ve never used a liner.

 

[brianmidmich]

I’ve always ran a 15 degree down bag for late season hunts with no issues. You definitely want a quality sleeping pad with a minimum R-Value of 4. Sleeping pad makes all the difference IMO. I’ve never used a liner.

So when you say sleeping pad, you mean like an actual foam pad not an inflatable right?

 

[PoniBoy]

So when you say sleeping pad, you mean like an actual foam pad not an inflatable right?

No, I use an inflatable pad. Right now for late season I’m using the Boundary Deluxe from Big Agnes. Solid pad and keeps me plenty warm off the ground.