What's the lightest backpacking pillow worth buying?

For thru-hikers and gram-counters, the Sea to Summit Aeros Down and the standard Aeros Premium are the most frequently recommended picks in r/Ultralight, both compressing to roughly the size of a lime. Heavier hybrid options like the NEMO Fillo are widely acknowledged in cleverhiker.com's coverage to be three to four times heavier and generally not the ultralight choice.