15~20 lung full of air doesn't sound too bad for a night of comfort.
I will put this in my list of things to add in the future. (may be for next year spring treks)
Already stretching my budget with many other things for now.
Yesterday, I bought entry level rain jackets from Montbell's factory outlet. Got Montbell Thunderpass at 20% off, and Montbell Rain Hiker for around 35% off. Both of them were last year's models, so big discount.
And for sleeping bags, we purchased one Nanga UDD Bag 380DX and another Montbell Seamless Down Hugger 800 #3.
Thank you all for sharing your experiences.