Topic

Sleeping bag temp extension "discovery"

Viewing 5 posts - 1 through 5 (of 5 total)
PostedNov 13, 2019 at 7:00 am

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!

Chris R BPL Member
PostedNov 13, 2019 at 3:07 pm

T’Rest also make some self adhesive snaps that fasten to the underside of your pad. You could probably make your own with some Tenacious tape if you can’t find some in the sale bin somewhere.

PostedNov 13, 2019 at 3:14 pm

Thinly insulated overbags have been around for decades. I still have a light, synthetic filled Montbell/Chouinard bag from 1986. They work!

I suspect few bag makers offer them anymore due to how practical they are… most of these makers would prefer we all have a minimum of 2 or 3 bags!

PS, I know you’re describing a single top “insulated sheet”, not a full over bag, but the principle is the same.

PostedNov 13, 2019 at 9:00 pm

Brad,

Yeah, it’s just a top synthetic insulated layer but as mentioned my mattresses are warm. Plus I always lay my pants and middle insulation layers under my mattress to add insulation and save space in that small Moment DW solo tent.

Matt Dirksen BPL Member
PostedNov 13, 2019 at 9:22 pm

Nice.

For several years now, I’ve been stuffing my quilts entirely inside of a silk mummy liner, in order to add a little CLO value to my overall system. But the best benefit from doing this is it entirely wicks away all the surface condensation I used to get.

It’s a lot easier to dry out a silk mummy liner than a quilt or sleeping bag.

This past weekend, I had a toasty night’s sleep in 19d weather under that silk liner, a 50d down quilt overbag and a 40d quilt inside of that.  While the 50d quilt had a tiny tiny bit of dampness near the top (probably from my breath), everything else was perfectly dry.

Viewing 5 posts - 1 through 5 (of 5 total)
Loading...