Aegismax have a good range of ultralight hoodless mummy sleeping bags. These sleeping bags are prefect for use with a beaine to keep your head warm instead of a hood. Doing this can save on both space and weight inside your backpack.
The tapered shape of the bag saves on the overall weight and allows the bag to be packed down to an ultra small size. This packed size is small, just a little bit larger than acan of soft drink (depending on the model).
Aegismax Online makes finding the right hoodless mummy sleeping bag easier before taking you to Aliexpress for checkout.