Hello,
I'm getting a bit sick of having a heavy ass backpack when doing 2 days expeditions (both winter and summer), so I'm trying to lighten my pack.
Usually, I take too much security gear that I don't use but I don't feel confortable getting rid of it (Escaper, 3 Pitons, small diameter 5m rope, 1 quicklink). By it for goulottes/trad/arêtes, they don't leave my pack.
But for the sleeping gear, my girlfriend and I have a rather heavy but comfortable tent (2.7kg I guess?) and I think we could cut some weight here. The prices of ultra lightweight tents are stupidly high and we are not planning on changing the tent. Moreover, where I'm based, refuges are neither big nor comfortable so we prefer to bring a tent.
Hence, I was looking at the bivvy bags.
But I never tried it, so I don't know if it's usual to have one and sleep in one in alpinism expeditions? And there are so many kinds, for winter expeditions, are an "extreme" one, such as the one from samaya mandatory?
I'm based in Pyrénées mountain range, so the nights are not exceedingly cold but can still be up to - 20/25°c.
Thank you for your insights!