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I use a Zenbivy bag and so far its been good to me, the main downside is that it doesnt have a back so your warmth is going to come from your sleeping mats R value. Easy enough to fix just get a higher rated pad than you already like.
pros: lightweight, packs smol asf for the warmth, modular so u can use as a quilt if wanted or as a mummy
cons: no back, footbox will have a really tiny hole even when fully laced not a big issue but an existent one