Several years ago at a Sierra Club conference at the Clair Tappan Lodge I won both a Thermarest Trail Pro pad and as well a top “sheet” and snap-on light polyester insulated cover.
It finally dawned on me that I could slip my WM Megalite 3 season bag inside the cover, using the cover for another added 15 F. of warmth and to collect most of the condensed perspiration from the night.
Tonight I tried it out in my living room but using a thicker REI FLASH insulated air mattress. The cover was roomy and did not compress the down bag. Yea! Plus I have another, warmer FLASH air mattress, the All Season version, that may be better suited to the hoped for low temps.
AND,.. if I sewed on three 3/4″ wide black elastic bands to the insulated cover I could leave the top mattress sheet at home and save weight. That black elastic is found at fabric stores in rolls.
Well, in early December I’ll behopingfor a cold snap and, if it happens, hike up to 9,000 ft. in my nearby Spring Mountains to my favorite site and test this out for a few nights. The overstuffed WM Megalite bag is good to 20 F. so maybe I’ll get a 10 F. night to test the combo.
WHY didn’t I think this when I first got the cover? Sheesh!

