EE 50 degree UQ plus Hennessy Double Bubble plus sleeping bag options

[kunzman]

If I use these in conjunction with one another what effective temperature rating could I expect to achieve? Will be sleeping in either a 32 or 20 degree synthetic bag on top of the Double Bubble. With the 32 degree bag would I be good down to 40? With the 20, maybe to 30?

[bkrgi]

Only way to confirm is to test it out for you.
We can speculate that it could work.
Your limits are with the UQ and bubble pad and as temps drop moisture could be a serious issue as well.

Test it out with a bail out plan/place would be my advice so you understand the limits relative to you.

[kunzman]

May go with the EE 50 degree UQ and a ThermaRest ProLite and the 20 degree bag.