I had (and stupidly sold) a fantastic Berghaus 'Big Wall' bivi bag, which was insulated with Primaloft down the bottom 2/3rds. It meant that I didn't have to carry a full sleeping bag and could get away with just a down jacket and a liner bag inside it. I have tried to buy it back but to no avail!

Are there any other recommendations for anything similar which would allow me to leave a full sleeping bag at home?

Montane used to do a waterproof sleeping bag that had taped seams called the Minimus iirc

Macpac did a range of sleeping bags with waterproof outers also, though not seam sealed.

Crux do or did bags with eVent shells.

Thanks all, hadn't come across waterproof bags before - are they all that, or are they a compromise that need to be used with a tarp really anyway, or are they truly the best of both worlds?

drewbingham wrote: ↑Sat Jun 04, 2022 9:32 pm Thanks all, hadn't come across waterproof bags before - are they all that, or are they a compromise that need to be used with a tarp really anyway, or are they truly the best of both worlds?

My experience with a couple of properly waterproof bivis in proper rain is that a small tarp makes life more comfortable.

I'm with Rich here. While the waterproof bag I had was good and worked as expected, it was no different to using a non-waterproof bag inside a waterproof bivvy bag. The addition of a tarp (even a small one) makes life much more pleasant unless you can guarantee no rain.

I think PHD might offer an insulated bivvy for high mountain bivouac, no doubt eyewateringly expensive though.

Insulated trousers/pants?

A few half bag / pied d'elephant type alpine climbing bags on the market, may be worth a look at those combined with a standard bivi bag?