I am using bourbon.io for the flexbox grid system. My final css compressed is less than 4k for the whole site.
@import "path/to/bootstrap/scss/bootstrap-grid"
[1] https://github.com/twbs/bootstrap/blob/v4-dev/scss/bootstrap...https://github.com/twbs/bootstrap/blob/v4-dev/scss/bootstrap...
Do you know where we can learn more about this?