Trying to get it to match your hat?
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I should add I bought a PHD sleeping bag (150gms) cover which has boosted the warmth of my bag alot and keeps the condensation from tent walls off pretty well. I'll throw a liner inside during this winter and it will be good.
@birch: Definitely NOT directly on the ground. They insulate against radiative heat loss pretty well, thanks to their reflective inner surface, but will do nothing to protect against conductive heat loss. For that, you will need a thermal mat of some description.
5 Ways Your Body Loses Heat and How to Avoid Them | PreppingToSurvive.com
Im going to give one of these a crack. I've got its big brother and love it.
I like synthetic because its immediately warm and doesn't get cold and clammy in your tent/fly. The latest fillers are great. They are much more compact and lighter than is the past. Cheap too :)
HyperLamina
@stretch thanks for that link, it made for interesting reading, i tried puting my inflateable mat inside bivi along with me and sleeping bag and its do-able but a little tight and i bet if i put mat under i will just slide off it during the night, i did think of tying it on some how but im not sure, but i can defineitly see the heat benifit of the bivi
im also trying to cut weight tent wise ( currently 2.2 kg ) so was thinking along the likes of a bivi with the hoop at the head end to allow some ventilation, but then im also wondering about a fly too but i might just start another thread for that one
Keep your current Bivvy, get a lightweight groundsheet to protect your inflatable mattress, and a fly. If it pisses down, and you've got JUST your Bivvy for shelter, you're going to hate being stuck inside it for any length of time.
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Anyone tried one of the Zpacks bags?
ZPacks.com Ultralight Backpacking Gear - 900 Fill Power Goose Down Sleeping Bags
Mont Bell - spiral 600 .... Purchased one from the states last year . Packed weight In it's cram bag is 0.700grams and roughly the size of a loaf of vogels. Extreme rating -8 or something close to that ..... Cost about $400 ( stronger USD back then) landed and was purchased tru the campsaver website , but shipped by a friend to NZ.
Cheers
I purchased one of these last week:
Outdoor Clothing - Camping & Travel Gear - Kathmandu
Lightweight (0.61kg) and packs down tiny. Sale price is good too. I am 6" and fairly broad shouldered and i fit the regular size comfortably.
Good for summer hunting. I used it over the weekend and was impressed. Would be okay in winter (North Island) if staying in a hut and you wore thermals (which you would already have packed). Next step up in warm would be their Pathfinder bag, small and light also, but it's twice the price.
some very interesting light weight options mentioned in this thread - are any sold locally ?
I'm looking into options to save weight and volume with a bag or quilt in "-7 C or there abouts" range.
As my legs and knees get older I'm chasing anything to drop some weight out my kit.