Bushwalk Australia

G'day
I will be in Kosciuszko area for three weeks this winter, snow camping. July to August.
Not confident that I can sleep comfortably with a combination of my existing gear so looking for advice please.

Tent for alpine is a Bibler, BD Eldorado.

Mat is an STS xs insulated.
Add CCF 3mm of 2m length, or a use a shorter CCF 10mm and something underfoot.

My warmest bag is an STS Ascent 2, comfort -4°C

Existing gear options to add to sleeping bag is any or all of:
OMM synthetic halfbag
Klymit versa blanket, synthetic
Roman 5°C synthetic bag (mid/limit temp)
SOL lite emergency bivvy

Can I make a warm enough combo from this gear, or do I need to buy/loan a better sleeping bag...

[edit, name correction to Ascent]

Enlightened equipment had a good guide for layering quilts.

https://support.enlightenedequipment.co ... ro-camping

I've done similar layering with my 10°C down summer quilt and my 0°C down quilt to around -10°C.

Of course comfort and layering is subjective.

I guess my uncertainty is if double-bagging by putting the Roman bag with an assumed 'limit' rating of 5°C over the STS bag with official comfort rating of -4°C would boost the combo to a comfort
-10°C?

If it did but temps happened to drop lower I'd just suffer a little that night.

Or if the emergency bivvy would have any effect as a VBL or over-bag.

For me the comfort -4 rating has been accurate wearing thermals socks beanie with ground insulation, without added extremes of wind/rain/snow.

For me the comfort -4 has been accurate wearing thermals socks beanie with ground insulation.

Same for me. Toasty warm in the snow.

Loungeroom test.
The Roman (a palm 4) is shorter than the Ascent 2 long. Tried the Roman on the outside and it is a pinch tight too, probably limits the down loft of the Ascent bag.

However, tried the synthetic Roman as the inner bag and I might be on a winner with that combo!

No not happy with layering what I have, compromise the loft of the Ascent 2 from either inside or over-bagging. Even rediscovered a synthetic sleeping bag I had in the late 80s. Not quite right.

Have instead bought an STS Glow 1 synthetic quilt in long, made to suit my down bag. It should fit over nicely and even clip on. $191 and 750g.

Hopefully enough and may even solve that body moisture/dew-point/freeze situation nicely! Can head up the escarpment for some sub zero testing closer to snow trip time

Well done. Was following whilst you found warmthness. Just curious Neo do you have the Al 1 or 11? Your specs -'Comfort' match the Al1. Just had a squiz, as I know someone looking for a bag, at the specs. Or do you actually have the Al1 model?
Do you have this one https://seatosummit.com/product/altitud ... ii-womens/ 'comfort' suggests minus 10-but you find it OK to no more than minus 4?

Hi Lamont
Here is a photo of the storage bag, same specifications are printed along the side zip baffle of the sleeping bag too.

From memory in 2019 I sold a Micro III which was comfort +4°C and put that money towards this green Ascent II at comfort -4°C that same winter week.

Then in 2020 we weren't allowed out for winter.Barely used as I go with the other gear in combination with a UL puffy and layers most of the year.

So mine is a green Ascent 2, not the womens version and probably a 2019/2020 release model.

I think it is great. They have a stiffened fabric treatment along the zippers which helps prevent snagging, nice added draft/draught baffles, the extra part-length zip on the opposite side can be handy, I like having a foot zip and can also open the whole thing out and use it similar a quilt.

Ah ha! You egg it said 'Altitude' in the original post. That's what had me confused.
Looks good. May your feet be always toasty.

Struth, sorry about that! I am always saying the wrong word. Maybe I should dox all other references, but I kinda answered my own post.
[edit, fixed OP]

Like my own UL synthetic overquilt I expect it would give you an extra 8 to 10 degrees of lower limit and at the same time help with keeping the down bag dryer.
The key will be keeping it in place, the straps are important