@each $breakpoint, $size in $container-max-widths {
  @include media-breakpoint-up(#{$breakpoint}) {
    // Build selector list
    $selectors: (".container", ".container-fluid");

    // Add all .container-<bp> to the list
    @each $bp, $val in $container-max-widths {
      $selectors: append($selectors, ".container-#{$bp}", comma);
    }

    // Output selector group
    #{join($selectors, ', ')} {
      &.container-max-#{$breakpoint} {
        max-width: $size;
      }
    }
  }
}