WTB lightweight but bomber sleeping bag liner

I’m planning some on-route bivys for a trip this winter, expecting lows of 30 degrees, hoping to be prepared for 20 degrees.

Have a good bivy sac, pad, layers and now looking for a good ultra light sleeping bag/ liner that packs to water bottle size ideally.

Not planning for much sleep on those nights, but surviving is good! Let me know if you have anything or suggestions even.

Thanks!


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